All of this is pretty well documented. The A-body /6 and V8 boxes are the same. In fact, the vast majority of manual steering boxes are the same- and the vast majority had bushings and not bearings.
Some of the B-body V8 applications had bearings in the manual steering boxes, but that was it.
All of the A/B/E body manual steering boxes were the small sector shaft too, and that didn’t change like the power steering boxes did. There are large sector Mopar manual steering boxes, but they were for trucks, vans and C-bodies.
This is all covered here, with pictures
Steering Box Info
So I would imagine that the PST boxes, since they appear to be exact reproductions of the factory manual boxes, would be bushed. And that would be just like factory for pretty much any A body, /6 or V8. Except maybe some of the race specials, but they were different in a lot of other ways too.