whats the biggest tire a Dart Sport or Duster will fit with comfortably???

68 Sedan said

Theoretically it would have only moved the tire 1/4" closer to the spring. And if you have 3/4" with a 3.75 backspace then with a 4" you would have about 1/2" clearance on the inside, and about 3/8" on the outside.

That sound right? I'm fixin to go through this soon and want to get it right.

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That would be correct. I also had new quarter panels put on both sides of the car, so I'm not sure if the lip on the wheel well is different than it was on the factory quarters either. Either way, I would still have put the SS springs on the car to get the rear up a little, or at least some ESPO springs or heavier than stock /6 springs.