Schebler Model S Duplex Fuel Drip

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Have a 1929  8-90 that has a Schebler Duplex Updraft carburetor.  The carburetor is dripping fuel from the lower air intake elbow when the car is not running after it sits for a while.   This has not always been the case, so something has changed. Was wondering if anyone has lessons learned/experience with this type of issue.

An area of interest for the source of this leak is the needle and seat.  The carb has a Viton tipped needle and hard seat.  I was wondering if a bad float adjustment could be causing leak-by at the needle and seat, allowing fuel to drip through the jets that are in the air intake tube.   The Duplex on the car is the cast bowl type that has the removable needle and seat.  A related question is where exactly to measure the 23/64" float adjustment measurement from.  From reading the available literature, it appears that this measurement is take from the top of the float, to the underside of the carb body above the float.

As far as reference material goes, I have the typical Auburn and Dykes information for the Carb.  I would like to have a cut-away view of the inside of the carb.  The manuals have a cutaway of the brass bowl type.  I need a cutaway view of the cast bowl type.  I am interested to see if there is a transfer slot inside the carb that could be allowing fuel to travel into the air intake tube and drip down.  

Any other comments, suggestions, ideas are encouraged and welcome.

A call is always ok as well.

Vic Fregonese
email:  [email protected]
Ph:  704-662-5849