That's as close as I expect anyone will get - kudos!
In 1953 Cyril Kieft ran this modified AJB air-cooled flat four, designed by Archie Butterworth. He took delivery of one of the early examples, which had Steyr cylinder barrels and heads, and had these swapped for Norton equivalents. At the time, Cyril spoke of mounting a challenge to Porsche, but the engine proved hard to cool. The AJB-Norton-Kieft engine passed through various hands and, in the 1970s, Ian Richardson used it in his successful sprint motorcycle, Moonraker. Richardson used the engine for years with no problems and his many wins make you wonder what might have been.
More on the Moonraker bike
here.