340 with edelbrock heads overheating

ok, so its getting late but i went out and sprayed some carb cleaner around the base of the carb. When i spray the rear of the carb where it meets the intake the car stumbles and stalls out. Looks like I have a vacuum leak. Could this be the cause of the overheating. Please say yes because i am tired of messing with this thing.
Probably not helping. To lean can cause overheating. Retarded timing can too and it doesn't take much to go from lean and/or incorrect initial timing overheating to no over heating.