8 3/4 differential with 10' brakes

Someone just posted some for sale.

What do you know about this rear?

Is it a REAL A body 8 3/4?
Is it 5x4" bolt pattern?
If your drums are 10x1.75 and turnable do that.

Post some photos of the backing plate dammage
It's out of 1971 Demon that sat in field for 30+years. It's a small bolt pattern. The brake drums are shot. There badly rusted.
It has 4:10 gear, that's rust pitted. It think I may have bent the drums when trying to get them off. I did find rear drums at Layson restoration.