I think your guy is on the right track in that the carb is probably the issue. I haven't seen a carb with a spring loaded main, so that is puzzling. Maybe someone else on the forum knows of that. Or maybe he is seeing the metering rod apparatus, which might be jammed. It sounds like that carb is a mess. The idle circuit probably is plugged up. Maybe the main as well. Since it runs on gas down the throat we know the engine runs. It's just dying because the carb isn't feeding it. The bowl is full, so gas is not being pulled from carb, which tallies with blocked passages or with the metering rod not pulling up. Baling wire through the passages and getting the metering rod taken care of might get it going.
I wouldn't go with any exotic measures at this point. Probably the carb.
Good thing you are not bringing your own truck, as it would have to run upside down.
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