(with apologies to Monty Python)
Not BS at all. The Holley/Hoomperschnarkle 6213 mod was intended for use on low torque zero rpm engines for export to Scandanavian countries, East Germany, and the Dutch Lowlands.
The ingenious combination of extremely high vacuum coupled with no fuel flow prevented engine wear and overheating, as well as lower as-installed engine height, making it possible to fit in the trunk of a DAF without banging the lid.
The ad specifically mentions army green paint, a clue that this was an early (Boxing day morning, 1969) prototype knocked together by Johann Gambolputty de von Ausfern- schplenden- schlitter- fried- digger- dingle- dangle- dongle- dungle- burstein- von- knacker- thrasher- apple- banger- horowitz- grumblemeyer- spelterwasser- kurstlich- himbleeisen- bahnwagen- gutenabend- bitte- ein- nürnburger- bratwustle- gerspurten- mitz- weimache- luber- hundsfut- gumberaber- shönedanker- kalbsfleisch- mittler- aucher von Hautkopft of Ulm, and a couple of trusted assistants.
The term 'found in a dumpster' is actually a euphanism for 'spirited away while no one was looking'. This is a true find.