Holley question

I just put in a new comp cam/lifters today along with a New Holley 600 on top of a weiland intake..... Everything started up and sounds great... the Holley has an electric choke.............. heres my problem/question.... it shuts down after a while, like it is not getting fuel, or to much.... after pullings the air cleaner i can see fuel dripping into the carb, also, it will fire back up when i floor the pedal.... put it in gear and dies....doesnt do this all the time, and once its going in gear, it doesnt stall or die....its a brand spankin new carb..... anyone ever had this problem? any ideas on what it could be?