Just to keep things interesting, crapping out on light throttle wouldn't be caused by a problem with fuel delivery to the carb. At this point, the bowl is full--or it should be. You could disconnect the fuel line, and the vehicle should "goose" for at least a couple of throttle raps.

Along with many other go/no-go tests I'd make, for the no goose, the first thing I would check is accelerator pump shot.