does it have the 8 3/4 with skinny 1 3/4" brakes?

if so,I dont think that back space is gonna work

I ran 7" with 4 1/2" bs with 245/60/15 on a slab sided 68 Dart

but had large offset on the axle to run the larger brakes and greens in the 8 3/4 rear

that made it 1/2" wider..1/4" each side

with a lage brake 7 1/4" rear axle it would rub and needed 4 1/4" back space on the rims

I think the back space is gonna be the problem,the 68 cuda has more room to the out side than to the inside,and the skinny brakes make it close on the spring as it is

might have to bolt them up to check for sure.

hope that helped and did not confuse and kill your sale..