I moved the rear springs against the frame rails with the mopar kit and had the rear housing narrowed 2" each side(it was a bbody 8-3/4 housing) and I can easily fit a 235/60 15 drag radial which is 8" wide. I will buy a 28" tall 9" wide tire when I burn these up. On the front, with the 73-up disc conversion, a 205/70R15 tire rubs the very lower front edge on the wheel opening. Those tires are about 25" tall. A lower profile tire with about 24" diameter could be much wider and still work. All this is on a 66 which will be a straight line car when finished. o----o<>