10” Rim on rear of stock ‘72 Demon??

On a Duster with no spring mods at all, my buddy ran a 15x10 with 5.5" Back space and a 28x10.5 MT et dragslick no rubbing. Demon should be the same . I was going to buy his used tires and wheels, but they were ugly Pro stars so i passed.
Hey I have a 68Plymouth Valiant got a deal on some drag slicks MT 29.5 x 10.5 x 15 hopefully they will fit underneath have 15x10 wheels 5.5 back space