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You can check the throttle shaft for leaks by using a unlit propane tourch. If there is a change in idle when you pass the propne over the area the leak is a issue. You can also test the carb to intake gasket the same way. When you rebuilt the carb did you make sure the passage way in the carb throught was open and clean? Many forget to check it. There are many passage ways each and every one must be spotless clean for a carb to work 100%. And almost clean carb will, run an engine but for example may not idel proper. On another point, are you sure your spark is good and hot and perfectly timed? This includes no slop in the distributor shaft or rotor and cap issues. A lot of what looks like carb problems are really on the spark side.