This is where there are 2 paths: restoration/original or updated...

The '59 will have the old brakes, e-brake/parking brake, ball & trunnion ft U-joint, and tapered axles.
A later complete drivetrain is more easily serviceable, both parts & maintenance.
Rearend width & probably saddles, AT shift mechanism, and e-brake cables would have to be figured out.
IIRC, changing the rooster comb in a later Torqueflite to the '65 part solves the push-button issue.

If it's a restoration, while the engine's out, there's plenty of time to work on other areas.