If he has a ‘67 K it’s irrelevant, since the ‘73+ center link won’t work with the ‘67 idler, and the ‘73 up idler won’t fit the K.
If it’s a 68+ K, it could be either steering set up and it doesn’t matter, both work fine. And if he somehow has a large sector pitman on a small sector steering box, well, it would be unsteerable at any speed.
And FYI, the manual boxes never changed. Same for the whole run for A/B/E bodies.