Post your wheel and tire combos.
70 Dart Swinger
275/60/15 MT Et street radials
15x8.5 Centerline Autodrags 4 7/8 (4.875) Backspace
BBP 8.75 cut to 51" flange to flange, total width drum to drum 56.25". If I did it again, I'd have cut the rear to 50.75 then used spacers to locate the wheels. Easier to add some spacer than take away axle length or add backspace. :) It's REALLY close to the outer wheel lip. Gonna have to roll it.
Home made 3/4" spring relocation kit.
Has maybe 3/8-1/2" on each side of tire in factory wheelwell... TIGHT!