Don't feel to bad man, even highly modded balts are going to struggle against V8 f-bodies from a dig. They have whp and wtq in the mid 300's and there RWD.
Avoid dead stop races, try to race from a roll with those guys. But if you have to do a race from a dig, do NOT go WOT in first approaching redline. Feather it a little bit and shift a little early if you have to.
Your having similar problems to me and i am decently modded, so your stocker seems like a factory freak. Anyway, goodluck!
Trans-ams may be the "chariots of the gods" but cobalts are still being made!!!! =D