To get to that power level and still pass emissions properly in CA you will have to be somewhat careful. I recommend doing things that don't attract attention from the people doing the testing because they can fail you on visual if they want to. Here is a plan that will get you to 325rwhp:
Head work - you will need to do headgaskets on an SC anyway, so you might as well do the heads while they are off. It won't affect emissions measurably and it's completely invisible. I recommend a cam to go with this but it has to be specifically designed for CA.
Keep the stock exhaust manifolds and EGR system (if your year had it). The rest of the exhaust should be changed to 2.25" duals but run 4 of the metallic core cats. Yes, I said 4. Be sure to get new 02 sensors.
Get a ported late model blower and MP plenum, or if you find a good deal on an MPX that will work too. Make sure you connect the EGR if your car came with it. You may not need it functional to pass, but if you do you'll want it in there. OD needs to be 15%.
You'll need at least 42lb injectors, but 60's work good too. 80's are too big. You'll need a cold air intake, 85mm TB, and 3.5" or bigger MAF to match. Of course a chip will also be needed to tell the EEC what size the MAF and injectors are. You'll need tuning as well so consider getting a QH and software for datalogging, etc.
A FMIC is going to really help overall performance and consistency, but you'll have to decide if you want to take the hit in the stock look department. A double IC from Ken will also help if you don't want the look of the FMIC.
If you do the work yourself and make good deals on used parts you might be able to do this for $4500-5000. If you buy all new parts you'll probably have $6000 or so in parts and do the work yourself. If you have a shop do it, count on $8-10K by the time you are done.
It does sound like maybe you aren't ready to dive into heads/cam though, so you should probably set your sights more at 270-280rwhp. That can be achieved for a lot less money and no internal engine mods.
Good luck!