Steve Magro in Australia came up trumps yet again when he kindly forwarded the pictures and information on this unusual machine.
Steve writes... here are two pics of a Higgs platinum plated bike in West Australia, with a JAP engine. It's a 4 valver with a Street head on it, turned around the other way so that the chain drive is on the oil pump side. Higgs designed some form of gadget with a gear to turn the chain(?) up top. Interesting idea huh?
I doubt if it was ever raced, but it was in a long tracker frame. Second picture is a carb, modeled on the Wal Phillips fuel injection type.