8 3/4" Options For '65 Valiant

I'm an old fart getting back into this after many years.

I re-poed my son's '65 valiant after he decided he didn't want to make payments on the truck that I co-signed for. The Valiant was colateral.

Anyway, up until a couple of years ago I was one of the pioneering gearheads modding the new LS bodied Chargers, but that is a lot more civilized than wrenching on '60s technology.

I did own a '70 340 dart Swinger 4-speed in 1973 so I'm not a total greenhorn.

Getting to the point.

I'm going to change out to front disc brakes so I want to do the diff swap at the same time so that I can run 5 X 4 1/2" wheels all around.

What are my options as far as getting a proper width 8 3/4" diff under the rear?