Starter stays engaged ONLY in park???

OK when you get into the wiring diagrams, go on past them and you'll find charts there for the various connectors and approximate location. On the diagrams, there are big oval figures, with references inside to tell you what connector. EG "CE-2" is "Connector, Engine no2 and those are referenced on the diagram to the diagram in the connector chart.

"CI-2" is "Connector, Instrument" meaning a connector in the instrument panel group, and so on.

SOME wiring problems--because of the way the new style ones are drawn, you will also want to go to MyMopar and download the two-page aftermarket diagrams and if possible, print them out. These are NOT as complete and do not show all detail, but they can be easier 'to follow."

These......

https://www.mymopar.com/downloads/wiringdiagrams/1974Wiring.zip

For some reason he has grouped these up and "zipped" them. You will have to expand them and pick the two you want.

https://www.mymopar.com/downloads/wiringdiagrams/1974Wiring.zip