I suggest getting a vacuum guage and hood it into a non-ported vacuum sorce on the carb or the intake manifold. Use the mixture screws to get highest vacuum and use the idle screw for the rpm you want. Adjust these against each other until you are happy. Then if you still have a bad idle, along with the problems listed above, maybe the carb needs a through cleaning or maybe the power valve is out? What kind of shape is the distributor it? These are the things I would look at.
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