Was hoping to use 8 inch rim in the rear and 6.5 in the frontWhat are the rim widths?
I have 255 60 15 on 6.5 inch wide rallye wheels.
They fit, look and wear fine but they are technically 2 sizes too wide.
I measured a lot on my 71 Road Runner and as Mark said 275-60/15 on the rear with a 15x8 and 4.5 back space. Front 245-60/15 on a 15x7 4" back space was perfect. Pics when I get home.