Just saw that N.E. Taylor boatworks in Sarasota / Cortez Florida put up a pair of 871 detroit diesels out of a Trumpy for 5K. on Facebook Marketplace. They were forced to scrap the boat due to termite damage. They probably have other parts too. Sounds like they have other stuff for sale for these old yachts.
I'm sure original naturals with 2 valve heads. Sadly, not going to be much of a market for them. They were near bomb proof engines. Thx for posting.