A little help to verify what I am thinking?

Strut rod bushing allow but limit lateral wear on lower arm bushings also.
As a 73 it is possible that lower arm bushings and strut rod bushings have never been replaced.
If that pivot pin is eating away at its hole though the K you should have a pretty good squeak over speed bumps.
If you want to replace only those easy to get to, less labor parts, fine, but that may not fix it.