Planning to upgrade the 12 bolt rear end in my 1970

[diggerbob]

I'm going to have a buddy rebuild the rear end in my 1970 SB. I plan to upgrade the old open carrier with an Eaton limited slip differential and will get a new 3.73 ring and pinion gearset. I called Toms Differentials today and they said that they can't get the 3.73 US gear ring set anymore so it looks like I will go with Yukon on the ringset. Does anyone have any useful bits of wisdom to offer regarding what vendors to check with? As of now, it looks like Toms Differentials for the Eaton unit and installation kit and Randy's Ring and Pinion for the gear set.