7.25 to 8.75 conversion 1974 Valiant

I’ve got a 1974 Valiant with front discs so I’ve got bbp. I have an e body housing im having shortened and I have a body axles that have been drilled for bbp. I’m assuming I have 10” in drums in the rear which I’m hoping to use. Can I use the backing plates from my 7.25? And is there anything else I need to complete the swap?