I ran a 833 OD in my Duster for years , it ran 11.7 1/4s & pulled the front wheels 2-3' off the ground launching , they seem to handle the power ok
the common 70 trannys used thje 4.80 front brg retainers , the front retainer on the OD can be machined down to 4.80 easily so you can use a normal behousing, & the 23 spline cltuches are common