When you shut it off how long did you let it drip?
What you may be seeing is residual fuel clinging to the inside walls of the intake, especially in cool weather. When the engine is shut off, the gas comes running back down because the air flow that was suspending it has stopped.
Try leaving it the gas on a couple minutes and see if it will stop.
When I assemble a carburetor, I like to turn the top upside down and suck on the fuel fitting, then put my tongue over the hole. It should hold vacuum. If it doesn't, something is leaking. Not necessarily the needle valve. If the seat did not fully screw down on the gasket it will leak.
Did you test the float for gas inside a pontoon? You can give it the shake test or float it in water, see if it floats evenly.
And finally, most flooding conditions are caused by rust flakes or trash in the tank. The fuel must be clean, only takes a tiny speck to hols the needle valve open, a sliver of rust can damage the sealing surface. There should be a screen in the inlet fitting of the carb, a screen on top of the sediment bowl, and a screen standing upright inside the tank. All three need to be in place and the tank clean and not flaking rust. If the tank is flaking or dirty it will continue to have problems.
Inline filters are not good with gravity systems. If you want to use an inline filter, find a screen type, not a pleated paper, they clog quickly and are too restrictive.
One other thing I like to do, before making the final fuel line connection to the carb, turn the gas on, let the line flush while you make the connection. This is especially helpful if the area around the fitting is crusty with dirt and grease.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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