tire width plymouth duster

KnuckleDuster said

Running 15x8 4.25" backspace with 275/60R15
3/8" clearance to stock spring location, stock 8-3/4 A body rear.
Much more room to the fender lip, not at home so no exact number, BUT this also depends on your ride height. My springs are one inch over stock

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That's why the type of axle and bolt pattern are so important. With a SBP 8 3/4 that might be possible, but with the extra 5/16" or so you get per side from BBP axles you'd need more backspacing.

Also a great illustration of why ride height is so important. With that ride height and those springs the quarter clearance means almost nothing, you'll never hit the quarters. Lower it an inch and it's a different story.