Toolmanmike pretty much nailed it. I think 255’s may be a little optimistic. I know they fit his car (and others) but the body tolerances on these cars isn’t great. If you have a car that’s on the narrow side of the tolerance, the 255/60/15’s can rub. Especially if the wheel isn’t perfectly centered in the wheel house. A 245/60/15 is a “safer” choice, gives you a little more leeway if everything isn’t perfectly square and equal. And some of these cars don’t even have the same clearance on both sides of the car. Even a 245/60/15 isn’t necessarily a slam dunk on all of them, there are Darts that have a hard time fitting 245’s in the back. I’ve measured my ‘71 Dart a whole bunch of times, I’m still on the fence between 245’s and 255’s. Pretty sure the 255’s will fit, but it’s tight. And being wrong buying tires is expensive.
So, break out a tape measure and a carpenters square and figure out the straight line distance from your wheel mounting surface to the springs and from the wheel mounting surface to the quarter lip. Do that, and we can figure out your ideal backspace and if you have the space to run 255’s.
