Holley 4150 dripping fuel from primary discharge nozzle?

Had a Demon whose needle seats would not hold fuel back. Carb would load up at idle and slowly drown and die. You could see fuel pulling from booster in drops. Sounds like your level is high or pressure is too much but 4 is low even for a holley, they usualy like 7. 4 is for Edelbrock/Carters. Air bleeds are small holes right inside air cleaner base. I would look at meter block gaskets. they are about a buck each at a speed shop.