Wheel backspacing on Duster w/ 68 B-body rear

Hemihead2 said
As stated- 68 BBP B-body rear is now in my Duster. Anyone have a combo that fills the wheel well without rubbing? Could I get away with using 15x7 Rallye wheels?? Interested in tucking the tire closer to the leaf spring. Any help/ pics is appreciated!

Are the leaf springs still in the factory location?

I have a '68 B body rear end in my Duster with a 1/2" spring offset. I run 18x10's with a 7" backspace, they're a bit closer the springs but I run disks that push them out a bit. Without the spring offset obviously you'd need less backspace than that, and less backspace with 15's because of the larger sidewall overhang.

I wouldn't run 15x7's on a Duster even with stock spring locations, you can fit 275/60/15's on 15x8's with all the stock stuff on most cars, some definitely need some quarter lip rolling and obviously it depends on ride height.

With the springs in the stock location, you'd be looking at a 15x8" with about 5.75" of backspace to center things up. With factory offsets even a 15x7 with a 4.25" backspace and 225/60/15's was right on the quarter. With the wider rear axle you will likely need custom offset wheels.