Re-Wiring 1975 Plymouth Duster

UPDATE: The first picture is what it looks like under the hood. it has a 360 engine in it (obviously not stock).

As i am trying to identify components I am noticing how difficult it is trying to use a stock Schematic on a car that has sort of been Frankensteined over the years.

The second image is of the firewall, the connector circled is a connector i cannot seem to find a pin layout of I am hoping someone can help.

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Connector.jpg