This sounds like a fuel enrichment valve issue-is the block resistor still connected before the wire enters the fuel enrichnmet valve wire plug? If there's not a resistor then you could be burning out the FEV very quickly, this would make for a good idle and starting ability but fall on it's face when throttled up. I'd check this to eliminate it as a possible issue.
test:
remove FEV from carb by removing the 2 screws
note the position of the valve (length)
apply power either by connecting to the plug (ignition "on") or by jumper wires from a 12v. power source
After 2-3 mins. the valve should extend about a 1/4"
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