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

Hi all, I need some serious wiring help for my ignition setup. I’m not electrical savvy but have read about 20 post and tried others suggestions that they commented before making my own post but nothing seems to work. The one good thing is I am learning a lot about the electrical the hard way lol I’ve been restoring this car since I was 16 and I’m almost ready to drive but this wiring has held me up for over 2 weeks.
2 weeks ago I finished hooking up all the electrical, got in the car and she cranked instantly and idled great. I did this about 10 times over 2 days (very proud of getting it finally cranked for the first time) Then I go to work come back to show my son how it sounds and it struggles for the first time and won’t crank (does turn over) I tried 2 more times and then boom a big back fire out the exhaust a 2 second idle and then died. (Also saw a little fuel spray out the top of the carb) I figured it was flooded waited until morning to try again and ever since it will turn like it wants to start but never starts and has backfired a couple more times. After reading all the post I changed the single ballast, ICM, and ignition coil, just to see if it was one of those. Then I tried measuring test with my multimeter and wasent showing what other people said it should be. So now I checked all wires for damage or grounding out, pulled the center bulk head disconnect and double checked my wiring and can’t find anything causing the bad reads.

So this is what I got
Single ballast, ignition coil and ICM
I am getting 12v read at battery
I am getting 9.8v read on hot side of ballast
I am getting 9.6V on right side of ballast
I am getting 9.8V on +side of coil with key in on position
I am getting 1V on -side of coil with key in on position
I am getting 11.2V when reading #1 socket hole on ICM wiring plug
*** When cranking the coil +side drops from 9.6V to 4.2 Volts*****

I have a wire going from the +side of the coil, spliced into my dark blue ign 1 wire (actually two blue wires that were connected to the same plug) plugged into left side of ballast.

Then I have my black and yellow wire from my ICM plug to my coil -side

Also I have my blue and yellow wire from my ICM spliced into my brown Ign 2 wire (actually 2 brown wires, they were already connected to the plug from original harness) plugged into the right side of my ballast.

Please help, any and all suggestions welcome.