To your running issue:
Have you verified the fuel level with Clear tube method? If not, do so now.
With the carbs on and off repeatedly, did you bench synch them?
Also, please check the resistance of the plug caps with your meter. Should be very near 5k Ohms. Remove them from the plug wires to check.
I was under the impression that you couldn't check the fuel level on the 77-78 carbs, as their overfill works completely different? They close before the fuel ever reaches the overfill tubes, do they not? Or am I wrong? Either way, I checked the fuel level by filling the carb up and then opening it (without flipping it over), and they are all filled up.
I have bench synched them before, and also done a vacuum sync. As I haven't changed anything when it comes to the carb setup (but rather changed the ignition), I cannot see how this could cause any issues.
I haven't checked the resistance however! Will do that, thank you!