I guess I'm different from everybody else. I agree it should do mid 12s as-is, but since you're set on spending money, my opinion is subframe connectors,springs, caltracs & the appropriate shocks. That will probably eat up your money there, unless you do all the work yourself.
My train of thought is this: you can have all the hp you want. If it isn't going to the groundd you're wasting time & money. A more rigid platform with the proper leveraging set-up (caltracs) will allow the CAR (not engine) to put out the power necessary while staying together so you don't tear-up anything...........just my ...good luck