I have a 1991 V-6 Firebird that I want to replace the factory 15x7's with American Racing Torque Thrust D 15 x 8 wheel all the way around with 245/60/15's up front and 255/60/15's in back using B.F. Goodrich tires. Any recommendations on backspacing especially up front? I have 235/60/15's on the factory wheels and do get a little rubbing in full wheel lock turns so wanting to avoid that if I can stuff the 8" wide ones.

Yes, I know I can do 16" wheels, but it's a V-6, with only a little extra go power, still going to be more of a cruiser so being able to pull 5 g's in a corner is not a concern.

 

Best bs would be 4.5" for 8" rim and 3.5" for 7".

The 245 seems a little tall. It is a 26.6" tire and the 255 is 26.8". Stock tire height is 26". On the back go with a 275 50 on an 8" rim and front 235 60 on a 7". This would keep the height at 26". The taller the tire the more it will throw off your speedo.

Good luck