I have a 305 that i just built. everything on it is new. It has an Edelbrock 600 cfm and is running this Fuel Pump

As soon as i start the engine it runs fine for about 10 seconds and then dies. If I give it some gas it will postpone it from dying until it gets back to idle and then dies again. Fuel Pressure at the carb is 6 psi.

What should I do?

Thanks,