73-76 A-body 8 3/4 rear for 65 Dart?

So if I want to get an 8 3/4" rear in my 65 Dart with the LBP, the 73-76 A-body unit is the way to go, right?
Specs look like the spring perches are in almost exactly the same place, but the overall width is narrower. Anyone do this, and if so, any issues with the drums/rims/tires hitting the inner fenders on a car with stock inner fenders?

What should one expect to pay for a complete 8 3/4" rear from a 73-76 A-body?

I'm looking to upgrade my 65 Dart to LBP, and eventually 4-wheel discs. Most of the rear disc conversion kits are for the 8 3/4" rear. I may also look at a bib block swap too, so might as well.

Thanks!