Ford 8 inch rearend swap

That's the idea. I cannot be sure what car it came out of, but the guy listed it as 1964.5 v8... but he got it from a guy, who got it from a guy, etc. It's got 1:3.00 gearing and I think my valiant has 1:2.93(?) or something very close.

According to my notes, '65-66 Mustangs were 57 1/8" wide drum face to drum face for the 8" and the 9". Mavericks and Comets were at 56 1/2".