Can I ask for more troubleshooting? I've narrowed it down a bit

[TimQ]

A few months ago I posted a long description of an intermittent stalling and starting problem I've been having with my 1986 C-10 (V6, 4.3, auto). The long description can be found here.

I've narrowed it down now to a clear intermittent spark issue. Last week I replaced the entire distributor unit which included a new module, coils, cap, rotor, etc. and I even did the plugs and wires too. So, everything between the wire from the ignition all the way to the plugs is new.

After I got it running again (originally missed the part in the book about noting the configuration of the old dizzy before pulling it so getting the time on was a bit fun) I changed the oil (a first for me) and took off to test her out. Drove about 10 miles to a gas station and filled her up while getting a drink. Came back out and the damn thing wouldn't start. This time I had some tools with me so I could check for spark and there was nothing. No spark at all. I tinkered with it for 20 minutes or so and then got pulled home by some nice fellows driving a Ford (yeah, they gave me grief but were fun about it).

Anyhow, here's the best part...when they got me home and the chains were unhooked, I tried starting it again and she turned right over. WTF!!!

Anyhow, at this point I assume I must have a broken/loose wire somewhere (already checked to see if the dizzy was a bit loose...it's not). I assume it would have to be between the ignition and the dizzy. What I'm looking for is some advice on where to look, what other wires there might be, etc.

For example, coming out the back of the dizzy I know there is a harness with a few wires that seem to run over towards the passenger side somewhere. What are those for? Basically, I'm just looking for some ideas on where wires go, etc. so I can begin testing with some sense of what things do and where they go. I've checked the various wiring diagrams I have and they aren't too clear at this level of detail.

Any and all suggestions are welcome and appreciated.

Thanks in advance,
TimQ