Anybody use a b-body 8.75?

I put an 8 3/4 out of a 66 Charger in my 71 Dart Swinger. Moved the perches in and used late 80's early 90's Chrysler minivan steel wheels (looked sort of like silver copcar wheels). They fit perfect and everything. Can't remember the backspace or how much the perches were moved in though :(