What did you adjust the needles to? Set to 1 turn on the low and 2 turns on the high. These will no doubt be rich settings but should get you running. With the metering lever set as per the video, all passages blown out with spray carb cleaner and needles set to above settings I have yet to see an engine that would not at least run. Another thing to check is that the throttle butterfly is in correctly. With some carbs it can be installed 180 degrees out. There may be a notch that lines up with passages in the carb Venturi.