Second brand new Holley carb flooding?

Hi thanks for the replays. This is the third new carb. The first new carb was a 670 Holley street avenger. It worked great and never flooded. The problem was that it stumbled at take off and I couldn't get it to stop so I sent it back and got the 750 double pump. Both the 750s that have flooded seem to have started it after letting off the gas and the motor winding down. The gas is coming out of the front lil tube that sticks up. I adjusted the float level and looked at the needle of the first 750 and it didn't help. The only reason I went with Holley is that say these things are tested before shipped and ready to bolt on at go. If I can't get get figured out I will never buy another Holley.