In the three year interim I've sold off my pre WWI stuff but do have scribbled notes original Model 20 had Budas, but no mention whether off-the-shelf engine, designed by Buda to Hudson specs or designed in-house and just built by Buda.
Also say1911 Model 33 engine, presumably state of the art at the time, designed in-house and just manufactured by Continental.
Assume you member HET club; otherwise only suggestions are checking with UK source--Hudson had later presence in UK but no info on earlier.
Also could move inquiry to either Hudson or Continental Motors forums below for wider exposure (or notes therein to see your post in Parts Wanted if allowed).
You might ask the Club if they have any info on possibility Cont'l may've sold the Hudson engine for other than cars/trucks (Ind'l, road const, Ag, etc)) either during Hudson use or after Hudson went to 6, under some Comt'l model #_
AAAH- found my Hudson=Railton book.., says exhibited iew 40 HP sux at "Olympia Show" 1913, so good chance exporting earlier.