<VV> Question re "smoking" carb a symptom of something?

[Charles Lee]

Question re symptoms: Is a "smoking" carb a symtom of something?
1965 110 PG runs OK for about a minute, then bucks like it will stall but
"recovers" running rough.
After shutting off (with key), both carbs "smoke" 
Putting hand over left carb gives me a palm full of gas.
Putting hand over right carb doesn't.
Vacuum hoses and fuel lines are all new.
Both carbs are rebuilt as close to Bob Helt's specs as possible, and all
ports pass carb cleaner freely, floats balanced and compression  is 140-150
in all cylinders.

Charles Lee