You guys crack me up.
If you only want 12's, you don't need anything fancy at all. You just need to drive it well, and hook up the power that you have.
You didn't mention if you have a T-5 or an AOD (manual or auto).
The biggest necessity is a pair of slicks. IMO its a waste of money for these high dollar engine combo's just to go spinning the power away down the track with street tires or even drag radials. Slicks are the only way to fly.
I went a best of 12.85@106 at a local slow track (always 3 tenths slower than another one I visit). The weather wasnt that great, I wasnt even power shifting, and the 60ft was only in the mid 1.7's, so it didnt hook THAT great.
This was with ported stock heads (free + tools/gaskets), a B303 cam ($100 on ebay), explorer intake ($150 from MW classifieds), and all the other usual boltons.
The car had atleast a 12.70 in it, if not more. But that combo is now gone, so we'll never know for sure
BUT if you want more out of the car, then I'd suggest a set of AFR165's, a custom cam, and a holley or performer RPM intake.
good luck with whatever you decide.
-drew