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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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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