Manual steering

Interchange on that box is in fact '62-'72 A- and B-body. Starting in '65 there are two varieties; the 6-cylinder cars got a box with plain bushings and the V8 cars got a lower-friction box with ball bearings to maintain steering effort levels despite the heavier engine. The difference between the two is not so large that one would readily notice it; if you have the option of two boxes in equally good condition then sure, pick the ball-bearing one, but if you have to choose a nice bushing box vs. a worn-out bearing box, get the bushing box. Look for a box that has at least a couple of threads showing on the sector shaft adjustment screw at the top of the box, and no discernible lash/play when you rotate the input shaft back and forth.

If you strike out locally I have a nice bearing-type box in good shape out of a '70 Dart; send me a PM.