My 67 is a good example. After I swapped the K out for the later 73 - later style K (spool motor mounts) I first had a manual steering box with 68-72 pitman, box, center link, and idler arm that is with the 73--later K
When I started to put it back together I switched to a 'big spline" power steering box, and so had to use a different pitman, and that pitman is the 73 - later style, so I had to ALSO use the 73 center link and the 73 / later idler arm.
I would NOT do what you propose. It might not be all that safe, might not drive and handle all that well.
