I would expect the gaskets at the bottom of the metering assembly, the round cylinder that is sandwiched in between the top and bottom of carb body. You have to experiment with different thicknesses of gasket material to get a good fit. I have also faced the ends of cylinder in the lathe to true up and clean up the gasket surface, take off minimal material.
Some of these rubber tipped float needles are not worth a $%# and flood the carb.
