B body rear axle in an A body

My '72 Dart has a B-body housing, not sure of the leaf spring offset, for a wheel, hold your breath, Mustang bullet wheels. The rear backset is about 6". Not sure of the rim width, they are 17". Tires are 245/45/17's. The fronts are from a different year and have a little less backset, but heave a spacer to get clearance for the rod end. I bought the car this way. If you would like more information, I will be out in the woodshed (garage) later.

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if those are factory style 17x8 bullitt wheels, they're 5.78" backspace (30mm offset).