Listening to the video, doesn't sound like a single cylinder misfiring, almost like the governor surging.
I would go back and check the distributor shaft for side play, needs to be very little side to side movement or the points won't stay set. If it is good, check the point gap. Also check the centrifugal advance. It should turn a few degrees and spring back. Could be stuck or sluggish.
And check the air cleaner, especially the wire mesh inside the canister, often overlooked. Check for mouse nests, mud dobbers too.
Back to the surging, that is typically a mixture problem. Once the other things are checked, try playing with the idle mixture screw. Most of the old carbs worked backward, turning the screw in richens the mix, backing it out leans it. If it changes nothing, there is a problem in the idle circuit.
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