Need Help With Wiring.

Just keep the 71 /6 harness in the car. You'll need to untape it and shorten the coil and oil pressure sending unit wires. The /6 uses all the same wires as the 360 except for the electronic ignition. That can be cut out of the 74 harness and installed using the schematic below. The harness from the 74 has a totally different firewall/bulkhead plug.

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