Wow man! I just read through all of this, well done and way to put your head down and just push through all the bad luck. I know you got your ignition issues fixed, just thought I would add something. I went through something similar when I had my 75 Vega where it kept breaking up at the top end ~7000 rpm in 2nd gear and I was pulling my hair out trying to figure it out. Even talked to the MSD guys as it was a 7AL2 that I had, and eventually it was a promod guy that figured it out for me. He suggested I tighten up my plug gap to no more than 0.025 gap, which was opposite to what the MSD guy was telling me. After trying a bunch of things I changed the plugs and closed the gap to what he said and the car never ran better.
Anyways this was a great thread, good luck this year you are do for some good runs.