[IROCdan330]

Look man...im gonna give you the low down beings youve got a tpi car and a lot of misinformation is being given to you from wherever you are getting it.

you aren't getting to the mid-low 12s in a TPI car unless you have nitrous or some sort of forced induction, or spend a lot of money on having the proper combination put together for you by someone like JS Performance.

Your car as it sits now, if its a L98 car, probably will run bone stock 14.7-15.1...Get some exhaust on the thing, get rid of the factory log exhaust manifolds and make it be able to exhale properly. The TPI intake has some breathing issues, and you need to make the decision to improve on it or ditch it entirely and go with something like a stealth ram (which isnt emissions legal by the way, no EGR)...
Suspension mods are your friend, although I know a lot of guys who run factory style suspension and can still cut sub 1.8 60's. you need a rear that can handle a good tire...the factory 10 bolt can for a little while so long as you arent making good power...but a quality drag radial will be your best mod right now and net you the most gain if you can drive.
Gears aren't necessarily a good idea if you plan on keeping TPI, and again you will need a decent tire/suspension to take full advantage. No car that goes fast is just "bolt on this part and be as fast as possible." It takes time, money, and know-how.

I'll write more later...my advice would be to stop asking questions for a little while and read a bit more, and try to understand. This isn't gonna happen overnight.