Cooked the rear in my Dart!

8-3/4 not that common only came with 340's or larger motors......

Not true. I parted out a 71 Valiant 4 door, slant 6 including disc brakes and an 8 & 3/4 with 3.23S.G. According to the build sheet it was a special order car with HD everything. Talked with the original owner who ordered it to tow a trailer but wanted slant economy when not towing.