7 3/4" and 8 1/4" rear weaknesses? (and other ?'s)

I beat the heck out of 8-1/4's for many years. 3:55's & 4:10's with a 4 speed. It does have richmond gears, auburn unit & all new bearings, etc. Never broke one but have spider cracked a few adjusters over the years. The real limiting factor is slicks, imo. I would not recommend one for anything other than a street tire small block car.