Tell me how strong was or is you 7 1/4 rear.

mine lasted 6 months behind a stock 360 4bbl and a 4 speed in my '63 Dart including some burnouts altho that was on 20+ year old 5.60x13 bias plies...

broke a big chunk off the crown wheel when push starting the car one day and swapped in an 8.25 - no problems since.