I ran 15x8 with 275/60/15 on the rear and 15x7 with 245/60/15 on the front.255/60/15's will fit on the front if your ride height is'nt too low.A more common front sixe is 225/70/15 if you don't want wide tires on the front.
8" with 4.5 backspace will clear on the rear.Front backspacing is'nt a concern.