I'm not familar with the edelbrock carbs but the simptoms you describe where a common problem on the quadrajets (one of the few they had) after sitting overnight the well plugs would leak draining the fuel from the float bowl so you would hafta crank the engine till the pump refilled the float bowls. I would call Edelbrocks tech line @ 1-800-416-8628 and see if there is something that could be leaking the bowls down. ( TOMCO had a fix for the quadrajets)