Carbs Leaking

Are the carburetors synchronized? If not vibrations may cause the needle vales to unseat. Fuel pressure over 7 psi will also cause leakage. Are the carburetor vent lines properly installed.

Bowl gaskets properly seated?  I prefer the newer composite-style gaskets as opposed to the earlier cork gaskets.

As David asked,  Is it leaking from the Bowl, or is it dripping out of the Carb Throat?

Exactly where is the leak originating from???

Does it drip with the engine running or is it only noticed when stopped?

Update, still an issue.

Owner told me the carbs had old rubber, so I did the 5 year on them and replaced all the rubber components.  The owner reinstalled the carbs himself, did a run up and afterwards they started leaking again.  Does not leak when engine is running.

Per the owner (I have not had a chance yet to go to the airplane), the leak is coming from where the air filter connects to the carb.  Per the owner, they did not do a static balance yet.

Looking for suggestions on what to look at next.  I've asked the owner to do the balancing.

Since it's coming out of the air intake side it could be heavy floats or the brass float armature that the floats push on are out of adjustment or the needle valve has an issue. If the floats aren't too heavy then the carbs need to come back off. Somebody missed something.