8 1/4 rear question

If it came out of an a body the whole entire rear end should be more than less a direct swap.. most internal parts are not interchangeable between different size rear ends. You can probably get away with brakes and Brake plates..
Did they have 8 1/4 rears in dusters? for a 318 or did they still use 7 1/4 stock for 318 and slant 6?