I got a friend with a 218cid Dodge, who got similar problem, but it ran again after some waiting. Hes car heated the Weber, and boiled gas.
When he stopped to let somebody pass (1 lane small roads ), engine running, started driving again, and after 30yards it sucked air like h... . Had to cut engine, and wait 15 min, than it was okay for the next steep hill, or next time he was going slow/idling.
Do your truck got right cooling? Try listen when you shut engine, if petrol is boiling.
Own experience of clogged gas line,behaved also like you told.
