I don't know the stock backspacing for the 14" wheels that would have been on your car (unless it's a Z) but I will check in a book I have. I can tell you that I'm running 15x7 Rallies with 4.25" backspacing with no clearance problems with BFG P225 60/R15. http://members.tripod.com/~Oldslots/Camaro/ATCarlisle99.html
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