Early A Body rear axle housing interchange questions.
Certain 8 inch Ford rears are almost a bolt in. Affordable, drop out center, parts available, 5 x 4 1/2 bolt pattern. Use the Cuda e-brake cables, either an adapter u-joint, or have the driveshaft modified for the Ford rear yoke and use a stock Ford u-joint. I'm using a 1976 Comet rear with a 4.10 spool.
PS: brakes are also the same size as the Mopar 10 x 1 3/4