Seeking advice concerning what may have caused my Pantera's ignition to stop working

My 1973 Pantera has decided to throw another curveball at me. We installed a new Edelbrock intake manifold and Holley Sniper EFI system in the car. After some significant effort, we finally had the car idling smoothly when it just died entirely. There is no longer any power when turning the ignition. The EFI system has been wired separately, directly to the battery as directed and none of the fuses or relays on the EFI harness are bad. We are getting 12v to the harness as expected and all wires added in have been soldered and/or using weatherproof connectors.

We did have to spend an inordinate amount of time trying to crank the car while adjusting the distributor, which entailed many repeated attempts with the ignition switch. I do catch a whiff of burnt ozone but I am not able to locate any burnt wiring and none of the fuses are popped behind the passenger outboard kick panel. I did not notice any smoke.

I am at a complete loss as to what happened here. The car idled smoothly and the EFI system entered closed loop mode for a minute or so before everything died. I can see no other wiring issues but I have yet to get under the dash. My plan is to remove the ignition switch and check overall cleanliness of the contacts, but I am curious what other folks have to say about what else could possibly be wrong. I have the wiring diagram for the original car wiring but I can’t seem to locate where main power comes into the car or where any other fuses or fusible links are located. The only thing that I know of now is that absolutely nothing happens when you turn the key. It’s just dead. Any input would be appreciated.

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