I got a used 1850 in a trade. The primary bowl was over filling, so I pulled it to check it out. The float is fine, the needle & seat weren't working right. I put another needle & seat in it and cleaned it up. Adjusted it low to hopefully start with the bowl not quite to the site hole, so I could fine tune. It overfilled again and poured out the vent tube. Is there something else that could be plugged or stuck that I'm missing? Fairly new to Holley carbs. Thanks!

UPDATE: Never mind. The needle & seat I stuck in was bad. Swapped from front to back and the problem is in the back now. Got a new one shipped and coming in on Monday.