A 9" wheel will need to be spot on with the BS...10" I don't think will happen unless you're raising the car, and you're on the wrong forum for that. My wife's 66 has 16x8" with a 255 and its tight.
IMO 17-18" rims look horrible unless they have the correct width and sidewall of tire. An 18x10 looks great but not sure you'll get there without modifying something. Just drop it off at the shop and build it the way you want it.
