[ryans69chevy]

If the c20 arms are just like the c10 arms then they have the same configuration. So you should be good to use a ball joint from a 72 on your 67 without problems! If your going that in depth with a swap I would go all the way and change out all bushings since your in there. If you end up doing that you will need to remove your A arms which then you could bring them into the parts store and "test fit" them to verify. Good luck!