Really weird ignition issue...

It was a joke, dork.

I know. I responded to it as such.

Ok. Whatever buddy. I'm tired of trying to help when effin MORONS refuse to do the SIMPLEST of things to check something out. I never said I dismissed a damn thing, either.

I didn't see anyone mention rotor phasing but Randy/AKA 1 Wild R/T, a guy that has not been wrong on anything that he has told me.
You tried but seemed stuck on the vacuum leak issue, one that has neither been confirmed nor denied because I don't trust the tool to get an accurate reading. Yes, the condition I started looking at seemed related to vacuum advance but what if it works fine but revealed a flaw elsewhere? You didn't leave room for that, you got stuck on the vacuum advance and potential leaks.

ALL I SUGGEST WAS YOU CHECK THE VACUUM ADVANCE WHICH YOU'RE OBVIOUSLY TOO HARD HEADED TO DO. So have fun with it.
When you repeatedly run into problems with people, maybe the problem isn't the other people, but you.
You can make suggestions but you can't expect people to do exactly what you want. If you continue to do that, you will be disappointed.

Again, I am not without fault and am certainly capable of letting good help slip right by me. Words and terms get thrown around and some of them stick to memory, some don't.
Correct me if I am wrong on this one issue:
The black lines on the distributor housings represent where the rotor sits at what will be #1 cylinder. This is with a reluctor point in line with the pickup.

distr 1.jpeg

Now, the #1 distributor is from the shed. The black paint mark is 1 1/4" from that screw.

distr 2.jpeg

The #2 distributor is what was in the car. Note that the line is 1 1/2" from the screw.

distr 5.jpeg

That difference means something. Now look closer at the notch in the top of the distributor shaft. It isn't in line with the reluctor point like you'd expect. This orients the position of the rotor.

1740378688695.jpeg

What if the improper rotor phasing was barely allowing it to fire before the vacuum advance and once the hose was connected, it moved the breaker plate enough to misfire? That is possible from what I understand.