As the title says, Im about to swap the engine in my 89 SC. My old engine has at least 200K (true miles unknown) and has a head gasket on the way out. I came accross a guy who had a 91 SC with 36K miles on it. During hurrican Gaston a couple years ago a rather large oak tree came down on the garage his SC was in an smashed the roof and rear of the car. Anyway, he pulled the drivetrain and was going to put it in a 97 Mustang until he was informed that his Mustang would no lnger pass our states required emissions inspection. The engine is super clean and doesn't look like its really even broken in yet. I bought the assembly as a complete drop out with the front suspension, crossmember, and all brackets and accessories. My question is basically do I need to look for anything on my car or this engine during the swap? Are there any wiring harnesses I would see until its too late? Will it have to do any modification to put a 91 engine in my 89 or should it just wire right up? My care is a 5 spd and this was an auto, witll this affect the swap? I have in the past upgraded later model mn-12 tbirds (94-97) from v-6 to v-8 cars rather easily, but with those the wiring harness unplugs in the corner. I can not find any such plug on my SC. Any insight will be greatly appreciated.