typewriter drive conversion??

Research this, but my understanding is that the 64- cars have a different shift pattern. 65 cars have the now-standard P-R-N-D-2-1 pattern (per Fed mandate), but still had the cable-shift transmission, so those have a 1-yr only valve body. But, I don't think there was a push-button shifter in 1965. My 65 Dart has a floor-shifter, and my 65 Newport a column shifter. BTW, my 65 C-body tranny has a sliding yoke output like later ones.

I think you might get a 64- push-button to work with a later tranny if you relabel the buttons to get the later pattern in the shift cable motion (might be able to move factory labels around). You would also need to connect to the lever on a later tranny, at the correct lever arm to match the cable motions. My 96 Voyager 2.4L A-413 "Torqueflite" transmission has a cable shift to a lever, and the internals are almost identical to 60's 904 trannys, so perhaps you could "leverage" some of those parts (pun), and those vans are hitting the junkyards. However, the shift cable is "grounded" w/ a plastic holder, which broke in my van, but a wrap of stainless wire fixed that.