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So about 10 Sec. into the vid you can hear the whistle im talking about, rebuilt the carb. Could it be the base gasket ? It only has one of those thin ones at the base.
Wow, that's a horrible vacuum leak. Make sure the spacer is on in the right orientation as well, there is a bump out on one side that has to match up with a spot on the manifold or there will be a leak.
Did it start when you put that air cleaner on? I know my buddy put one on his G-van and it whistled wicked. Probably not your problem but that made a pretty horrific hiss.