Hei conversion troubleshooting

I tried the HEI setup on my 71 Duster, had no spark so set it up on the bench and it's sparks no problem. I believe I'm not isolating the ignition 'start' and 'run' leads to trigger the 12v relay. Does anyone know the pin assignments coming off the bulkhead wiring block for both start and run? The mopar wiring schematic shows no switching info for the ignition switch. I don't want to just start cutting wires just to isolate them.

Thanks!