swapping rearends 7.25 to 8.25

I would think that it would have to go by years. If you are running the wide shoe then you can rob parts from the 5th avenue's from the 80's cause those 7 1/4's had the same brakes as the 8 1/4's. But the 7 1/4 rear that was originally in my 64 Valiant wouldn't work case the shoes wouldn't fit the 8 1/4 axles. Yes they will bolt on, but all depends what the shoes you have.

Lee