Get the Pford. After 64 GM went cheap on their rearednds and used the axle for the inner race of the bearing. If you get a rough bearing replace the axle and the bearing??? Pford has recently done this with their 8.8" rear. The 8" Pford will take a lot. This is from one with experience and have spent many $$$ on a Chevy 10 bolt.
Hope this helps
Dennis