K frame swap question

You could just use the 67 K-Member with the 73 disks, I would. This keeps the biscuit type mounts. The spool mounts on the 73 K-Member are a superior design, but since it is a /6 K-Member it's a moot point. The 67 K-member had a one-year-only idler arm, but the pitman arm is the same from 67-72. Nothing really wrong with the 67 idler arm, just keep that in mind when you order parts.