72 Slant-Six 4 Speed

Most 833s used a 4.35" input bearing retainer, same as the 3 speed. All you really need is a non OD tranny, shifter, and front yoke on the driveshaft.

100% correct.

I would get ahold of Passon or Brewer's, they would probably sell you a complete trans etc. rebuilt and ready to bolt in and go.