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Rocky, Thanks for the reply, I have been fighting this thing for about 3 months now and one of the thing suggested was drilling that hole or cutting the gasket a tad between the carb halves. It was more of a diagnostic thing than a fix. When I first rebuilt the carb it looked pretty rough at the mating surfaces so I put a sheet of medium grit sandpaper on a sheet of glass and used that to get the surfaces flat and as true as I could. The choke does not help in either case, not with the hole open nor closed. This hole is very small, about the diameter of a small paperclip. This is just one of those things that I have decided "I am going to fix it, come he11 or high water". I can use it like it is, but that is not the point, something just ain't right and I want it to be RIGHT. It is not just some old junker, I have a lot of time and energy in it, as most of us do.

Have you ever had a timing light on it, to verify the mech. advance is working? (Yeah, I know, front-mount, no timing marks. Easy enough to make your own on the front pulley.)

Have you ever looked at it on an ignition scope?

And, I'd be LOST without an ignition 'scope.