Hmm, a 1971 plane, 150hp engine installed in 1972, original logbook is missing, "sold as is where is".
I suspect that first logbook has the engine installation info. If the STC paperwork is also missing, this could be an expensive airplane to make legal. Seems safe enough having been around all those years, but getting a legal sign-off could be an adventure.
Hopefully the FAA 337 was filed with the FAA, and a copy can be obtained from Oklahoma City.
