(Another) Slant 6 No-Start Thread

Let me begin by saying that prior to this the car has always started easy and reliably. When I first got it it didn't run. I put new plugs in it and it's ran right ever since. Until recently. Here's the story, I had just finished welding on new frame rails (safetcaps actually) so I can finally daily the car and it won't start. Nothing is helping, it just won't. So I go back to college, and I come home a week or so later and before I decide to pull everything apart I give it a crank and it starts up! It sounds like it's on only a couple cylinders so let it warm up a tad and rev it some and after a minute it's purring along like it should be. Gas tank reinstalled, starts up, never even stalls from the air bubble, running great. We've turned it on and off like 5 times over the weekend and the no start is gone. So we take it for a test drive, and blow the metal fuel line. Fast forward to earlier this week, fuel like fixed, and the no start is back. The obvious culprit would be fuel but we have pressure, you can hear the idle (port?) spraying and you get a good shot when you pump the throttle. Here's the tests we've done: compression: decent. About 110 on all cylinders
Fuel: yep it's getting fuel
Electricals: it's been upgraded to an electronic ignition at some point before I owned it. We're getting 8 volts at the coil if I recall, 11.9 at one side of the ballast and 9 something at the other. We've tested if the coil wire will spark to metal and it does but it's not lightening. We pulled a plug connected it and cranked to see if it sparked and we got some minor fizzling around the base part and weak intermittent sparks to the ground strap. I'm guessing my problem lies here. The failure points I've identified from searches are bad grounds, why would that be intermittent? And bad wiring. Whoever installed the electronic control box just clipped one of it's wires on to the lowered voltage side of the ballast resistor along with the connector that belongs there. I've since swapped in a real wire but still just wrapped onto the post because I have no idea how it should be wired. I won't be home again until next Friday but I'd really appreciate some tips on what to check. It's so weird that it's such an intermittent issue!