Going to the junkyard on Friday weather permitting! Going for the front end pieces this week and maybe next week the rear-end and drive-shaft! If I can find a A-body with a 8 3/4 rear I'll snag that, if not I'll go for the 8 1/4.
Forget the 8.75" rear. It's way more expensive; the 8.25" is plenty strong and will have a ratio (2.73?) that works well with a turbocharged slant six both on the drag strip and the hiway, plus it is considerably lighter, and saps considerably less parasitic power...
Both 500 hp slant sixes in the 120+ mph range that have been tested have proven this gear ratio business out. It works.. and is a money-saver!!!