Max tire size - 68 dart

Funny 'cause my '69 Dart doesn't have that much room in the wheel wells, spring relocation or not. There is sheet metal in the way. Now when you start talking about mini-tubs, that is a completely different story. But the OP did not mention mini-tubs, and when I made my post earlier we were not talking about mini-tubs. You can disagree with me 100X if you want, I have measured my car and I know what will fit on it. 9.5" wide tire, maybe. Not a damn 11" tire. Maybe my car is fucked up somehow?

Maybe it is, because I also have 275's on my 68 with no mini tub or spring relocate. Aggresive lip trim, and some persuasion to the outer wheel house yes, & a B body axle.
Oh, and I forgot, a spacer.
Would I recommend it, or do it again? No. Not that way.
Bought the whole arrangement, Springs to lug nuts from a guy with a 69 dart going to a 4 link, tubs, & wrinkle walls.
Felt compelled to update
Mine are probably on rims that are too narrow. I measured the section width, and I have just under 10 1/4. But the fact is I drove them like that for many years, and they are on the car.