8 3/4 Rear End - General Questions, Seek all and any help, 1st restore!

Pics of Open Diff, not Sure Grip. Well the T block on top the housing multi-purposed. You need a flex house going to rear T block for a stock spring application because the rear moves, you need to split from one feed line to two lines, R & L side brakes, and the top of the hold down "bolt" is a vent for the housing.

Are you just wanting clean things up or changing gear ratios. If changing ratios you will need a dial indicator, diff side spanner adjusters and other items.