Well, if we're talking about an A-body 8 3/4 with BBP axles you'd want a 9" rim with about 5.25" of backspace, maybe a little more if everything is centered well. If it's a SBP 8 3/4 then 5" of backspace.
Section width on a 275/60/15 is 11" wide, so, anything with a section width smaller than that will work. Spring to quarter lip on a Duster with the stock spring location and uncut/unrolled quarters is ~12", so you can clear an 11" section without rubbing. With a 1/2" offset and trimmed back quarter lips like mine it's ~13", just over. That will clear a 12" section width tire without rubbing. If you want more than that inside of the quarters you'll need a 3" relocation and a mini tub, because the wheel tub is the limiting clearance on my Duster, not the springs.
And of course not all these cars are identical, so it pays to measure your car to make sure your measurements match mine. Most are pretty close, but some are off by enough to cause problems when you start talking about clearances that tight.
