I have a problem with my Holley 600 (4160)

The problem is too much heat. It is boiling (perculating) the gas in the carb after I shut down. I am going to get a heat suppressing gasket but I have a clearance problem. My air cleaner is already pressing into the insulation as it is. If I raise the carb a half inch with the heat gasket I won't be able to close the hood. I have an Edelbrock Performer intake with the Holley 600. there is only a single paper gasket now. Any suggestions would help. I thought about changing the breather but to what? I have a 13 inch x 2 1/2 now. This problem makes the car a little hard to start when the engine is at normal operating temp.