what size tire and wheel and offset

[moparraceman]

do i need on my 63 dart for max tire . it has stock 71/4" rear stock location can i get a 255x15 tire on a 7"x15 wheel ? what off set ? any info would help thanks 63 dart street racer

 

[DesertRat]

I have a stock suspension 1967 Barracuda. I landed on 15 X 8 with 4 1/8" backspace for 255-60's on my 74 8 1/4 rear axle. I think I could go 275-60's but have to trial fit to see.