I was at the gym on a machine sometime last week, watching the kind of thing I usually watch....and in the "suggested for you" area
a little something came across the youtube feed that looked rather familiar....
...the fuel lines, valve covers and breathers seemed to jog my memory.

I could definitely be wrong (someone please feel free to squash the illusion if I'm incorrect: Many folks live to do that, after all, so have fun/I don't care)
but I'm going to go way out on a limb and say, the engine looks very familiar and might even be the same one(???).
If it is the same one, Seems it's changed hands and has sat for a time.

Spoiler alert: They couldn't get the carbs to work hardly at all in the first video.
I have not watched part 2 yet and don't know what it entails, from the thumbnail it looks like they put a single plane on it.