Rear end swap ideas.. (Purists need not enter)

I have customers 1.3 60's on 10 bolts in single digits at 3600 lbs...

The only 10 bolt to stay away from are the 7.5's

I don't doubt you can build just about anything to handle a decent ammount of power. I'm not sure what was in my 70 Chevelle. Maybe it used the 7.5? That was nearly 30 yrs. ago and I wasn't into Chevy's long enough to learn much about them. I do recall that just about every guy I knew that built his car up to even run in the 13's and used the 10 bolt scattered it pretty quickly.