I'll also take a chance, wonder what the prize is?
It might be a cracked carb body due to the bottom bowl screw hole may have had some foreign (as opposed to domestic) material in the threads and when the screw was installed, it may have bottomed out and kept pushing. Thereby creating a minute crack and the fuel is following the threads and seeping through.
You can always empty out the salt shaker from the kitchen table and fill it with flour. Go out to carb and sprinkle flour all around. Find the dampness and there's your leak.
Another thing you might do is to apply 2-3 psi of shop air to the bowl vent. Look for leaks. If you have a carb with a fuel transfer tube for both bowls, then you will need to "Y" the vents together and pressurize both bowls together.
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CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.