Your suggestion to spray around the vacuum ports is a good one. Also, if you basically have the blades closed, what happens if you hold your hands over the carb to prevent most of the air from going through? If is still runs, air is getting in from somewhere else...
I can't tell from your picture, but are there vacuum hoses coming off the carb? If so can you just remove them and plug everything to rule out as much as you can there?
Another place that air can be pulled in is through the intake manifold gasket if it wasn't sealed well down in the valley area. Hard to tell with it all installed though.
I'm not very knowledgeable on distributors, but is it possible for you to completely lock the advance in some way to at least eliminate advance from the equation as you are trying to adjust the carb?
And time to ask the simplest of questions. Since it's running ok, I doubt this is a problem, but... You have double and triple checked the plug wires are ordered correctly, right?
And one more I can think of... When you pulled the distributor, everything looked ok with the gear, correct? I know a car which I had in the past started showing erratic timing when the gear was being eaten alive by the cam shaft due to using the wrong gear... :\
Just brainstorming as I type. Not sure much is helpful, but looking for outside the box ideas... Good luck!
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