1965 barracuda rear rear end?

The 7 1/4 axles could be had with sure grip much later. I have a 4.5 bolt pattern 7 1/4 with sure grip. I busted 7 1/4's but others went for years without trouble behind HP small blocks 273 Commandos to 340s. I wouldn't worry about it so much that it is a "must do" if other things need help too.