Drivetrain advice for engine swap

I sure would not install a 9 1/4!!!!!!!! Maybe a 9 3/4 = Dana 60!!

I know I did not fill very good with cross breading either but for 200.00 drum to drum versus 700.00! Gears, posi, & axles are cheaper as well. I'm still mopar at heart!!!!!!!!!!!

Most Mustangs in 70-73 had 9" just had to put that in there!!!! 60's hard to find 9" in a mustang!!