74 Duster trying to MELTDOWN!

I think you need to get off here and find someone locally to help you. It's different when

the car is working and something goes wrong

or you make a change/ add something/ different ignition or different alternator

and AFTER a minor change like the above, something "smokes."

But in THIS CASE you have had the car completely apart, and now after reassembly have a major MAJOR smoke issue.

Time to find a local friend who knows wiring

You have a shop manual? You have the wiring diagrams? You know how to read them?