Will any 8 3/4 fit???

The 8.8 might be a better choice .There's a couple threads that go into the swap with lots of good info on what years are the best. Definitely gonna be cheaper than the E body rear. I got lucky and found a flipped old mopar(62,63 Belvedere ). Being the narrowest B body rear, I don't have to narrow it but the spring perches need to be moved, and newer axles will need to be purchased.