[PGSigns]

I have 15X8 on my 66 and 235 70 fronts and the wheel is wider than I like. Trouble is any wider and the tire hits the fender. On the rear with 4" of back spacing and 275 60's the tires rub the inside of the wheel tubs when going in steep driveways. On my 65 that was on air 15X7 and 225's was all I could get to work on my setup and have room to turn when running low. Also you dont list the back spacing. A 15X8 with 4" of back spacing will hit the lower control arms with drop spindles and require a good bit of grinding on the lower control arms so you will have to test your wheels. If it were my truck I would be looking for another set of wheels. Not sure what else we can tell you.
Jimmy
Jimmy