Lol, F-Body = Camraro/Firebird.
5 speed GT's will turn low 14's outa the box, but atuo F-Bodies with turn mid 13's outa the box. Intake and headers will put you in high 12's, again with an auto. Nitrous can get you into the low 12's. Still, at this point, the worst youve done is replace the intake manifold with another stock one. That is, if the car is '98-00' if its 01/02 you dont even hafta do that. And its still dead nuts reliable too. All for maybe 11k, maybe.
So are you talking about your basic Camaro Z28? or Z28SS? Im fairly unfamiliar with Chevy's.