As mentioned the 8 3/4 from a 66 B-body works great as that's what i have in mine.I run a sb stroker though so no help on the mounts for you.There are a few on here with big blocks in F-bodies.Just remember that front end is already heavy before you add weight to it.
What is your plan with the car,street/strip?


77 Aspen R/T 60'@1.41 10.76 @ 123.26

http://www.youtube.com/watch?v=Eya3Ue8KoZk