Truck Dies after 15 minutes??

[2112]

I have been having an issue with my 72 c10 with a 307 and 2 barrel carb. It will start up fine and run great until it gets up to temperature. After a few minutes it just shuts off. If I try to start it again the ignition is dead and acts like the battery is dead. After a few hours it will start right up no problems and shut off again after a few minutes. Seems like something is shutting down once it gets warm. Anyone have an idea as to what it could be? Thanks for the help!