In this boat.
How about that. Seems a few of these 1950s 20-30 footers had small hemis. The website didn't say what size, but I can already say for sure it's not a 426. Probably not even a 392. Probably a 331 or that one in the 35? size
And this is one of 2 hemi powered boats for sale at the place I found. So - it might not be ready to throw in car, but it might have the rare hi po parts from the late 50s early 60s