clutch pedal interchangeability

I think the difference in the slant 6 and 318 or non hi po cars such as the 340,383,440 a- bodies had to do with the pedals swinging on nylon bushings as opposed to oillite bronze bushings. But the complete units do interchange from 67-76. As far as will a pre 66 set work in a later model, that I can't answwer.