Max tire and wheel size for 72 Dart

15x7 with 4.25 backspace and 255/60-15's worked for me. I have a 8 3/4 and stock springs with a extra leaf added. Small bolt wheels by Wheel Vintiques.
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What do you have on the front? I have a set of, I believe, 15x6.5 rallies (I never could figure out what they're off of, but Chrysler still had trim rings for them) and since your car has PERFECT stance, I want what you got, and for you to have something better.

If you're inclined to measure that rake, Either degrees or body height measurements, I'd sure be grateful. I've got super stock springs under my car and need to get them de-arched.

Will a slightly narrower rim make much of a difference?