727 ASSEMBLY GREASE QUESTION

Hi Folks

Asking any transmission gurus what they would suggest to use as assembly grease for a 1971 SB 727. Tom's book says to use sonnax slippery stick, but Im not sure it is available in my area. Any other suggestions?

Anyone have any links to a master rebuild kit? Looking for a good quality (last a lifetime of cruising) extensive kit........It's going to be behind a mild built 340 with 3.23's and a 2500 stall using type F. :)

Thanks