Doug, that is one amazing engine, thanks for posting the video! If I'm not mistaken, that is one of the DeBolt kits? They have come up with some of the nicest engine kits over the years.
Here is a Stickney hit-miss engine that I built many years ago from a DeBolt kit:
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This engine has a very unconventional carburetor, and I was never able to get it running consistently on gasoline. I did manage to get it running pretty well on propane. I had hundreds of hours in that engine, and stupidly sold it when I moved over twenty years ago. I feel your pain, Gil!
Paula