There is a lot of ways to do it. You can get a rear end out of a 87+ Turbo coupe rear end. They are 8.8 with rear discs and either come with 3.55 or 3.73 gears depending on the tranny. The rear end is slightly wider so the wheels will stick out unless you get some rims with a diffferent offset.

You can also do the ranger axles and drums which is the cheap way to do.

You can also do the ranger axles with flipped lincoln Mark VII calipers,