ECM Removal and associated wiring harness....

[SCPO-PD]

I am in the process of replacing the 305 in my 1983 Avanti with a 350 and am taking advantage of this effort to include the removal of the ECU.  As I was pulling the wiring harness through the fire wall I found a handful of the wires making their way to a double ganged plug / connector vice making their way out to the engine compartment.  This same connector set has wires using the same firewall pass through.  Any clues???  As we know the wiring diagrams for the Avanti are somewhat lacking....