8 3/4 conversion 67 barracuda Notchback help and info

He told me it came out of a 76 Duster. But here's the crazy thing... its a big bolt pattern. But he's never messed with it. Its been in the back of his shop for 30 odd years.
I'm going to guess that 8 3/4 is out of a B-body. Measure the center to center on the leaf spring mounting pads. 44" means it is a B-body rear. A-body should be 43". Measure the wheel mount to mount distance. Post what you find out here.