Ford 9" out of a 1973 Mercury Grand Marquis fit a 67 mustang. Guy near me selling for $20, also has a free 460 w/ heads. I will pick up if someone wants to pay shipping on it.
I doubt it. Check the widths between bacing plates. Isn't the Merc coil spring & 4-link? Also, it's probably got 2.75 gears. Big drum brakes could be useable...