Non self adjusting rear drum brakes on a Dart?

Take a look through here to see if you can find the tech tips for those.
search by using cntl-F in your browser.
Master Technician Service Conference - Chrysler's Training for Mechanics
1963 Booklet introduces the "servo-contact" (aka Bendix duo-servo) type brakes.
So yours should be in the earlier books/films.
such as 3-Platform (1959), Center-Plane, and Total Contact systems.