1974 Duster Idler arm question,

I’m getting my, new to me, duster ready for inspection and was checking over the steering and suspension since there was a lot of play in the wheel. Was thinking I needed to adjust the steering gear box and possibly have to change a tie rod or two. Well further inspection uncovered an issue that kinda bothers me! A turn of the wheel showed some major up and down movement in the idler arm where it mounts to the k-frame. It looks like there should be a spacer or shim on the top side of the idler arm inside the mount, looks like an inch or so??? Then I started to wonder if the k-frame was from something else, i.e. big block, and needed a different idler are. Any thoughts or suggestions?

v/r
Ron