65 barracuda need help with rim backspacing

I am working on the same thing. I made up a spacer for the front hanger to move the hanger back 3/4". offset hangers, I believe I will narrow 1"side from the perch to yhe end with e body back plates and axless. They stick out further than A body for the wider brakes. If you are going to narrow I would change over to the b,e,c axles for A body length. so you can get drums and brakes cheaper and easier.