Mopar performance alternator 1or 2 wire???

chinze57 said

1964 dart. All new wires, all new fuse box, connectors, etc.

Originally it had a radio from the factory but that was it for options. The bulkhead was actually disassembled and the connectors inside of it were replaced with new ones to be sure no 60 year old parts were being used electrically.

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If I recall (correct me if I'm wrong for '64) all of the wires connect at the bulkhead using a Packard 58 or Packard 56 type terminal.
One of the issues with these is the somewhat limited contact surfaces, and the other is like any terminal, the wire to terminal crimps.
The highest current flow is going to be in the alternator output wire.
The next highest flow can be through the battery charging wire. If the battery has been severely discharged, or repeatedly discharged (for example by running electric fans) then this circuit gets used a lot and more severely.

IIRC only 1963 and 1965 have ring terminal type connection through the firewall for these two circuits. Better clamping, more contact surface area, and more exposure to air for cooling.