Hey , Tim
That Mopar rearend would work, be the same lug pattern as the front. The rearend I have in my pickup is out of a 67 Chevelle (10 bolt) , it measures 60 inches overall. I have vintage American racing 8 1/2 x 15 with 255-60-15 Radial TA's and they clear the inside and outside about 3/4 of an inch. That Mopar rearend may be too wide for 10 in wheels and tires to clear the outside edges of your fenders. But I have been told that the 8 3/4 rearend can be narrowed fairly easy buy narrowing the housing and getting the axles shortened and resplined.