I have a 67 GTO HO I put 15" Ralley 1s on and it is 7" wide. I put 275 on the rear and 235 in front. I use red air bags inside the rear coil springs to give the car a little rake and it helps with the clearence. I'm not sure if 8' wheels will fit your car? What are you driving? Also not sure about back spacing. I don't know if this will help or not.
Ron
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