Hi from Phoenix AZ! Picked up a non-running 1974 Plymouth Valiant Scamp

Welcome! Awesome to see another late year Scamp being saved and put back on the road eventually!

Front discs were not standard until January 1976 so it was only the late 1976 model year A bodies that had them all.

I suspect your Scamp was made late in the production run for the 1974 model year since your front and rear bumper guards are from 1975. Or the previous owner swapped them but that would be unusual since most of the time the modification is to remove them entirely. The 1974 bumper guards had larger black plastic blocks sticking out from the chrome guards.

You’ve got the 1974 front grille. Does your instrument panel have one or two idiot lights to the left of the speedo?

Watch out for the dreaded seat belt interlock that was only on 1974 models (and some very early 1975 models) as it causes problems (which is why it was only used for one year).