Ricardo,
As many have said it sounds like you want a 25 year old car to compete with a modern brand new factory built car. It is very frustrating that your anticipated goals weren't achieved. Take it from someone who has bought, built, sold, bought, built, sold, bought, built sold on several occasions that it isn't easy. To achieve a pristine, looking, riding, performing and beautiful car takes out right sickening dedication and lots of time. Seriously lots of time, the upkeep alone for an SC would make anyone go crazy.
My very first 35th SC was my baby. When it was totaled by being rear ended I was seriously upset. It was actually my daily driver and I enjoyed every minute of that car. It was a steep learning curve with the SC and being in my mid 20's (wow I am seriously old now) I was eager without anything in the way to achieve my goals. I built 3 engines for that car. 3 different transmissions. Wade Embry rebuilt my supercharger nearly monthly. I look back and think you poor poor silly kid. Would I change any of it....HELL NO. I have made and continue to make my VERY BESTEST friends as a result of the SC. David & Kathy Neibert, Kurt & Jennifer Kreisz, Tony & Rose Serno, Kurt Sunday, Rod Maxsmovich Jr & Sr, Kelly Simons, David Dalke and family, John Vaniscycle and family, David Clark, Jacob Royer, Sally Thornsberry, Dan Thorsberry and family, Randy Hunerkoch, Matt Haub and family. Seriously the list goes one and on. When I was really running my first SCs hard prior to the first shootout I bet David Neibert and I wrenched on each other's cars nearly every weekend. So your list of little bits to correct on your car are seriously minimal in the grand sceam of things. It's going to take you the extra detail mindedness to finish it to your level of acceptance.
Most everyone knows my history of building my first 35th totaling it then transplanting it to the 1993. I absolutely hated what I did to the 93. (Added a cage). It is really the main reason I sold that car among other personal financial issues at the time. Then later when I was capable I bought a 1995 5spd. I turned it into a turbo, NON-AC, C4 trans brake car, that ran mid 10s on IRS and drag radials. That car wasn't what I anticipated the outcome to be. Yes it was fast and interesting BUT I turned what I really wanted into a track dedicated car. So I sold it and rebooted my ultimate goals. I am literally on my 5th build. My current 35th had very specific goals in mind. I listed them and stuck to them. To this day I haven't achieved what I believe is the original goal set. For example, I had delrin bushings, hated them removed them and went partial poly and stock. I had addco front rear sway bars. Hated them removed them and back to stock. I'm on my second set of pistons and rings. The motor has been apart 3 times since that build. The intercooler has been revamped 4 times. I'm not kidding 4 times. Guess what I don't even have one at all now straight methanol. Someone has already said it the car is never really done. Just upgraded from time to time. Since you listed some gripes on your car here is my current list.
Passenger window goes down really slow.
Driver door has a rattle inside. (I have searched and searched)
My rear main seal has a small leak (~~~~ to change.)
My AC while it works barely keeps up in south Florida.
My Pass headlight fogs up on the inside.
I have a driveline vibration that I cannot locate. Nothing terrible but I know its there.
Exhaust is WAY WAY too loud.
My 5 year old paint job has chips everywhere.
I have trim that needs touched up on the inside.
Somehow I have a scratch in the paint on my truck deck lid.
The car still wont run 11.5. Closest I have achieved is 11.8
I seriously hate the way the transmission shifts. Needs reprogrammed. Would take a day or so with help.
Car needs a serious under hood detail.
My K-member has dents, creases, from a pulley flying off.
My in-tank pump doesn't push the fuel it should for some reason so a boost a pump was added.
The list never ends.
Ohh and my current 35th has been on 3 different trailers going home from various events. Never fun, always embarrassing, and then the dreaded rebuild revamp. I even put it in TIME-OUT I was so pissed for over 9 months.
Most know I recently relocated to South Florida. I had to move the SC to Florida. I could of shipped it could of towed it but instead I drove it. 1900 miles. For the most part I had a great drive. My only issue was the AC wasn't charged before I went. I got 19MPG and even found some of the issues I had been searching to repair. That drive alone really made me appreciate the SC again. It's a big luxury/sport car. Every time I stopped for gas I got at least 2-3 compliments and questions on what is that. Every time I drive it here in S FL I get compliments. That alone is worth keeping it to me. When hurricane IRMA came my daily was sitting in an airport Parking lot. Guess what me and the WIFE drove it all over town getting the supplies we needed before the hurricane hit. I got 3-4 compliments that day.
Most of us build the SC because we WANT something different. We DON'T want to follow the mustang crowd. We pride ourselves in being maybe slightly off kilter doing something different. It's much more of a challenge that just buying some parts off the shelf. I have always prided myself in trying something different. Now I'm just stepping back and enjoying what I have and tackling the little things one by one when I have time.
Don't' give up we're are all here to help.
Cheers,
Chris