Help identifying differential 65 Barracuda V8

The original 7 1/4 rear in my 65 Barracuda Commando 273 4-speed lasted 90,000 miles and a lot of speed shifts. Even with a 4 barrel, you still only have 273 cubes (i.e., not a lot of torque). I'd just run the 7 1/4 for now. If it's in good shape it might outlast you. If not, well then you can replace it.