8 3/4 oil and limited slip additive suggestions?

I am in the process of buiolding up my 8 3/4 myself. I just bought the last of my parts and asked Cass what he recommends. He said 1052358 GM friction, 2 bottles. One to use while assembly and one in the rearend. Available at all GM dealerships. He also recomemended 3 bottles SuperTech 85w140. Cass owns Doctor Diff in montana. Good prices and very knowledgeable.