The manifolds are from a 1965 Barracuda. They are pretty restrictive, but fit like a glove.
We didn't tub the rear. We rolled the wheel lips, moved the springs in 5/8", and moved the axle and spring pack rearward 3/4" to center the wheel and tire in the opening.
Wheel is a 15 x 8 with 4.5" back space. It's a tight fit, but it fits and dosent rub