JAP 55 donor engine wanted

I have a very nice petrol/parafin variety with preheated intake, dual chamber tank, and the lot. Unfortunately the camgear has somehow lost 3 teeth, of which some residue ended up in the adjacent big end shell. The crank and the rest of the internals are good, but I’m lacking a camshaft and a STD big end shell to complete it. JAP 5 shells doesn’t fit as I found out, the journals are smaller.

It’s a really good object, complete, correct, not corroded, straight tins, good tank, and they’re pretty rare in this configuration. So I would love to come across a wreck or a parts donor to help me put it straight again.

Any help or info much appreciated, regards, Erik.