I recall seeing a lot of those Buc and always thought they were OMC. But according to whoever put this display together, if I’m seeing the color correctly, he has them marked as possible aftermarket.
I believe this display was put together by Art Sesselberg. He was the Yankee Chapter president at the time but has since passed away in 2016.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.