What is the largest wheel's I can put on a 1974 dodge dart 360 sport

QuickDart360 said
On the demon how close are the tires to inner fender of quarters?

Back rims on Demon are 15x8.5 with BFG 255 60-15's. Back spacing is 3 3/4 torque thrust D's. I have about 2in. Between tire and inner fenderwell.