Actually there are probably hundreds of posts about this...Rochester B and BC carburetors are very hard to keep from leaking. There are a couple of reasons why, but please do not use 2 gaskets. That will only make the situation worse. Here is a link on how to straighten the castings:
https://tinyurl.com/y8bbrhw6Since we don't know what year or model of truck you have it is hard to suggest a better solution. A Carter carburetor (instead of a Rochester) would stop the leaking and dribbling and would give you other advantages. Please always tell us the year of your truck, the year and size of the engine, etc. It is easier to answer your question if we know. Typically the Rochester B and BC float settings are 1 9/32 level and a float drop of 1 3/4, so one of your settings seems correct. New needle/seat? Different fuel pump (an electric which is too strong, maybe?)?
