Bypassing the fuel system may be a good idea. I had an M37 Dodge that acted similar to what you are describing. Turned out there was the body of a bug or fly in the fuel system that would get caught in a brass elbow fitting. When the engine would die, he would slip back a ways in the fuel line, only to eventually come back into the fitting on the next run.
Another option would be to crack the fuel line to the carb when it happens and see if there is fuel. Or, after it stalls, you can simply pour a little fuel into the carb and see if the truck runs on that. Some gasoline into a hand oiler will do the trick and limit the fire should things go awry.
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