73-76 A-body 8 3/4 rear for 65 Dart?

I got my 8 3/4 out of a '69 half ton pickup. It came complete, drum to drum with a 4.10 Suregrip for $225. It has 11" drums and 2 1/2" brakes. I am having it narrowed 54 1/2" axle flange to flange with spring perches on 43" centers. I found everything I need to rebuild the brakes at my local NAPA store. Just told them I need parts for a 73 New Yorker which came with 11" drums, 2 1/2" brakes and 5 x 4 1/2 BC.