I have a 67 B body 8.75 under my 92 Dak. Width is just a bit narrower on the 67 housing than my stock Dak.
Wouldn't take much other than relocating the spring perches.
But keep in mind the early RWAL was not that great of a system. Most people that I know have deleted the RWAL solenoid and plumbed in a regular brake system.
Also the Dak rear was still drum brake through at least 95. If you want a disc setup, maybe look into a Jeep Grand Cherokee rear diff?
The other thing is that for some reason the later 8.25 diffs dont seem to hold up like the earlier setups, they chew spider gears quite often. Even on a suregrip.
The 96+ Dak/Durango rear diff was a little over 2" wider than the early generation. So they may not fit well.