Slant 6 dies when driving

It hesitates and eventually will die, but will start right up and continue to hesitate. If it cools it will run smooth again for a while then if going from light to light the hesitation will begin again. It's a 74 with California emissions. Almost seems like a vacuum leak, but I don't see any broken lines.
hm maybe , but get a spray bottle with water in it and spray around the carb and intake were it meets at the head see if you hear any drop or change in idle you have a leak. i think it might be the pick up coil, i would replace the distributor and mopar ECU Box at the same time and see if it helps.