Find a 4 speed column? Sure. They are everywhere, and cheap too. I see them for $5 at every swap meet.
NOT.
Heres a better idea. Look in your local wrecking yards for 72-80 Dodge trucks with 4 speeds. The steering column parts are very similar. I have converted several column shift steering columns this way. They will not have the key lock lever like all the 71 and later cars did, but that wasn't an issue for me.