No parking lights and front side marker lights

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From MyMopar you will want to get the Dodge manual which is only a BODY manual, but also get the PLYMOUTH manual which is a chassis manual

Actually in this case the body manual has part of what you want, the firewall forward lighting wiring is on page 138 (5-46)

In the Plymouth manual, the instrument panel wiring is page 381. What you are interested in finding out is "if" the front parking lamps are on the same circuit as the tail. Earlier cars were separated. A quick look at the switch shows "P" (Parking lights) terminal is BLANK which means they are indeed connected to the tail circuit. So if the tail lamps are working, the light switch is outputting power to the parking light feed

This means the problem is either (unlikely) right there at the switch connector where the parking and tail lamps feed off, or (more likely) the bulkhead terminal where they feed out to the front

It also could be poor grounding "out front" or, (it happens) all the bulbs are bad