Reed, thank you very much for you continuing advice.
Since i have an older Holley 1945 that has no solenoid or other electronics, i think it has a "ported spark tube" as i gathered from another post of yours.
In that post you say that the ported spark tube gives the same signal as for the vacuum advance for the vacuum-based distributor. Here's the picture you have:
I have the same port in the same location, and that's where the previous meddler connected the ESA signal tube that goes to the transducer for the computer (event though nothing else seems to be connected to the computer).
So, if i am thinking right, then that would be doing nothing right for the computer, cause it's a different signal. But on the other hand, if i get a vacuum-advance distributor, i could run it to that and have a real simple spark advance, all based on vacuum, and leave the computer completely out of the whole thing, and even remove it.
Does that sound right?
See here is my carb and that smaller port that's below the connection to the canister, that is the one that is routed to the transducer of the computer right now.
