Positive offset is my front wheels. 12" wide and only 2" on the face side and 10" backspace. That way the control arms can be nice and long.
http://www.tirerack.com/wheels/tech/techpage.jsp?techid=101And it is INCREDIBLY nice to be able to get to everything fairly simply. I've worked on plenty of production based cars-that-are-raced and as you mention, a lot of it is huge PITA to work around. Additionally by the time you are done, you still have a lot of limitations. Sure it isnt cheap nor is it done in a few weekends, but for less than the cost of a used z06 I'll have a car that will destroy a whole ton of cars (p-cars, f-cars, vette, viper, etc) and it is based on a Coleman catalog.
HA! I always liked the olds bodystyles also but my favorites were the lt1 4th gens and the DeKon Monzas. I actually had two sets of DeKon bodywork when I bought this project and sold them both to help pay for it. For gt1, there is a TON of legal bodies. For Chev it is all gens of camaros, monzas, 63+ vettes, lumina, monte carlo and beretta. Buicks can be regals or somersets, and Olds can be Ciera, Cutlass, toronado and aurora (LOVED the aurora IMSA GTS cars!!!). There there is the firebirds, grand-prixs and fieros. Not all are T/A legal, but they can all run scca regionals and nationals.
I'm just crossing my fingers that T/A makes a comeback.
Costas
cars and such...