and as pioneerguy600 indicates in the previous post and especially if someone has already been flogging a HDC carb and possibly used a China clone kit that is not quite correct, keep a very close eye and heads up and inspect the new kit gaskets you are using and keep in mind that someone may have used a wrong diaphragm or gasket, especially the metering diaphragm with the little button for the metering lever. I've seen them different lengths and just close is not a good thing. Also keep in mind when installing the gaskets old to new comparison that someone may have used the wrong one, lay the gasket on the carb and look at the little holes and see if they match the carb's body. Strange but some of the carb kits now days are just not correct, even the welch plugs are wrong size on some carb kits. I do not pull a welch plug now days unless as a last resort and only then when I have a correct size replacement in hand. I have reformed old welch plugs if I could blow them out with air pressure. I suspect that some carbs, especially the smaller ones with check valves are actually ruined by using too much air pressure when cleaning.
I think I seen recently over on Leon's site, you tube where he was flogging a HDC or close type carb that the casting or cover plate was actually warped and he had some other tips about getting them sealed and bench testing..
Right when I think I'm good at repairing carbs one will get too me, put me in my place and sometimes a NEW China cheap clone will work, but don't be surprised if a clone is not really smooth as a OEM.
Summary: I feel your pain with them little carbs that look like Ronnie Milsap should be able to make them run, but, but.