Please help!! 1971 340 duster having major ignition wiring headaches.

The 4.2 when cranking means the starting/ ballast bypass IGN2 circuit is not working or wired wrong

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This sounds wrong. The blue is normally the IGN1 "run" coming from the key into the engine bay. That (if the one) feeds VR IGN terminal, alternator field, the key side of the ballast (not the coil directly)

Somehow I missed: What is the reason for this rewiring? Did the car have another system and you added this? Or is this some trial and error to get it working, or what?
So are you saying that my wire from the +coil side should be spliced into my brown wire which is on the opposite side of my ballast? To be clear I ran (spliced in) a single wire from my +coil side to the blue wire that runs from the (N) plug of the bulkhead disconnect( labeled ignition 1 in my wiring diagram)it plugs into the ballast and was there already with the stock wiring. If I’m not supposed to splice it in with that wire and just run it to the ballast directly and leave off the blue ignition 1 wire, where would that plug in then?

Also I got this car with a slant six, so we pulled the engine and tranny(plus everything else ) except the original wiring. It had no ballast, coil or ICM when I got it. Just engine, tranny and loose wires.
I really appreciate the help guys, thanks