I've been brainstorming this all morning and just thought about something, ignition-switch related: That one wire going to/from the starter solenoid is connected to the ignition switch, correct? What then is sending a signal to the HEI distributor?
I'm having a brain-fart here, need my schematics.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?