Are those wires "broken out" as a group and that much looks original? If so you can likely figure out what connector "it was" or write the wire colors and look up the manual. If you have the 73 service manual there's a chart on past the diagram that lists individual connectors
Does that car still have the troublesome engine disconnect connector? This was originally a white molex and also had the big alternator charge wire run through it. Looks like that one is a bit chopped up
