Some problems with exact OE reproductions include, as mentioned, you are not likely to find the correct harness configuration for your vehicle. I see some mods on that motor, likely the original harness configuration wouldn’t apply anyway. Also, exact reproductions include the original design weaknesses, undersized charging circuit wiring and routing through Packard 56 terminals in the bulkhead connector. Unless your original harness is completely toasted, rebuild it. Unwrap it, replace any damaged wires or connectors, clean-up or replace terminals as needed, upsize the alternator output wire, add or remove wiring as needed, then wrap it back up. Highly recommend by-passing the bulkhead charging circuit connection, run through a grommet straight to the ammeter.
I’ve used new M&H harnesses, expensive but decent quality. I cut them open, rework as needed, wrap them back up. Looks original but without the original design flaws.
