The carbs are either waaaaay too rich, or you've got a slight flooding situation. The float level(s) could be set a little too high, allowing fuel to trickle into the venturis at idle. That symptom would probably be more noticeable with the engine up to normal running temperature as it would be after an extended road trip.

Look for fuel percolating into the air stream (into the venturis) at a hot idle. If it is, lower the float level slightly. You might also consider going to a slightly leaner high speed jet to prevent sooting up the plugs under cruise conditions.
Jerry


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