Another No-Mod Tire Fitment Question

225/60/15 up front, 245/60/15 out back if it's an A-body 8 1/4. Should give you a decent stance and shouldn't require any significant modifications.

A 255 will fit some cars if the lip on the back of the quarter panel wheel opening is cut back for additional clearance. But based on the measurements I've taken off of my '71 dart, even with trimming the quarter lips the clearance would be minimal, so it might not work on all cars, and the backspace would have to be perfect. Definitely no guarantee they can made made to fit your car, even if they have been made to work on others. Plus not everyone wants to mess with cutting/rolling the quarter lips.