Motor is hard to start after warm up

My motor (273 with 500cfm Edlebrock carb) will crank good when it is cold but when I drive the car and let it set for 30 mins or more it will take a while before it will fire up again. It seems to have a hard time to get going after it finally cranks. I'm thinking that the carb is fluiding but not sure. I don't pat the throttle any before I crank it up because I'm thinking it is already got to much gas as is. I have mashed the gas pedal down just a little bit to let the motor get more air and it seems to help. The carb is mounted with a gasket between the intake. Do I need a heat divider or something? Thanks.