Wheel size and back spacing

YoungDart75 said

My stock rear end(7 1nd 1/4) right now looking at running a 8 1/4, 8 3/4, or 8.8. But the 7 1/4 setup, I had 15x9 245/60/15.

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Right, but you have a Dart if I'm not mistaken. Dusters, Demons, Dart Sports and Barracuda's have wheel tubs that are 1" wider than the Dart's do. Most Dart's can only run a 245, a few can run 255's, but that's it with the stock suspension.