79 300 no run?

I may not be much help here. I don't have wiring diagrams for a 79 Dobie unless you can post a link, and I believe they did away with the full current ammeter in them. That means the "usual" bulkhead connector problems may not apply.

But this still sounds like a problem like "bad bulkhead, BAD bulkhead!!!" or ignition switch, or wiring to/ from

Very FIRST thing is to get a factory or factory equivalent wiring diagram, or maybe even a reprint shop manual. If you get one on CD, it makes it easier to post sections of the diagrams or email them, etc.

One thing which I don't believe changed, is the way Mopar ignition works. That is, the ignition bypass (IGN2) I believe is still right in the ignition switch so if you have no ignition power "in start" it still should be one contact and one wire coming from the switch to the coil+ side of the ballast.

And "ignition run" (IGN 1) is the same, one contact on the switch, feeds the cluster power, and out into the engine bay feeding ignition, charging system, and some smog doo dads.