Re: Bad Fuel Pump??
I would start with an original shop manual, multimeter, and a compression guage. It could be a lot of things really. Many a high speed problem can be attributed to an electrical problem like a timer base, rect., power pack, stator, temp... etc. I have seen coil packs do something very similar at higher rpms also, from old wires arcing or the pack being weak, or corrosion. If it is ultimately a fuel problem then I would take it back to the person who did the carbs. The float height is a straight forward thing. All that said, it's pretty easy to pick up a piece of crud in the needle and seat or a jet. If it goes on for a while it can score the cylinder a little and it will read a good comp.# but at higher rpm under load it can wipe the cylinder wall clean when that piston temp comes up. Especially the top two cylinders.
It's a tedious job of process of elimination for a broad problem like you have but it'll be like a checkup for your motor.
Good luck
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Thank goodness that in the scheme of things you are broke, powerlesss and inconsequential, because with the shortsighted alternatives and idealogy you have you'd be much worse than those you complain about.
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