There is obviously a pretty small market for it. The engine itself, assuming it's in good shape, could be marketed to automotive buyers. If you check ebay, craigslist, and salvage sites, you'll see them sold for anywhere from $500 to maybe $1500. Some of us on this list might be interested in it, but shipping costs these days make that idea kinda tough.
The gearbox is not a good match for that engine, used in conventional front-engine aircraft, but might be good for 'pusher' style aircraft like the LongEze, Velocity, etc. that need to turn smaller, higher rpm props. You could try listing it on some of the canard aviation sites.
It's just getting harder to find buyers for rotary aircraft stuff these days, since the designer of that reduction drive retired.
Charlie