I have run all three under my Savoy and it currently sits on a Dana. When I got into the 11's I pulled the 8 3/4 and put a 9 under it because I knew it was stronger than the 8 3/4 with both rears being stock. My 9 had a factory "N" case with 33 spline. Moser axles and spool. It did good and is now under a 67 Camaro running low 9's with the same 4.56 gears I installed 18 years ago. The guy with the Camaro had an early B-body Dana under it and we made an even up swap. My Savoy isn't that fast with the best 60 being 1.47 and best time of 10.91 at 124 mph.
I am currently collecting parts to put a 9 back under it just because it's easier to work on.

Gus