Tip. Before you rebuild another old carb that may leak check the bowl gasket surfaces with a small straightedge for warpage or distortion. Alternately you can use a sheet of glass on the bench and lay the carbs mating surfaces on it and using a set of feeler gauges check for flatness that way. Typically you'll find the screw bosses making contact and the area between the screws leaving a gap against the glass. Minor distortions can be corrected by laying a full sheet of 220 papar on the glass and carefully running the carb pieces over it until the high spots are knocked down. When you think you have it smear a little coating of grease on one half of the carb and put the top on by hand pressure and not using the screws. Lift the top back off and check for full contact as shown by the grease wetting the other surface.
Mike ( by necessity a rebuilder of a lot of old junk
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