Many years ago, 1960, a friend and I bought an old 1936 17 foot speedboat with a badly cracked flathead engine. We bought a 53 Ford junk car and installed it's engine in place of the 36 engine, using the old water cooled exhaust manifolds and Little Joe's reverse gear. Everything fit like a glove. We skied with that boat for years and it ran flawlessly. The flathead made a great boat engine. A lot of boats have passed by since then but I remember it fondly, along with all the girls it attracted.