Did you check float levels yet? Do you have any way of knowing rich or lean? How much vacuum does it pull at idle? You should set your power valve just below that number so it opens under acceleration. You could install bigger jets and try the drive again and see if it improves. Your accelerator pump circuit could be plugged, or the wrong cam/nozzle combo. Watch the nozzles and crank the throttle, you should see a pretty healthy "squirt". Do you have a timing light to verify the timing hasn't changed?
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