Luke, if your boat is the first generation of Buehler Turbocraft, it may have the six cylinder and could be a different size compared to the V-8 version. heh V-8 version came out later in 1959. Check Craigslist and Ebay. There was a guy parting out one from Minnesota on Ebay a week ago and may have the engine box. Mine is fiberglass with a wood deck and upholstered pad on the deck.
I have a 1960 buehler 15'6" that has a fiberglass engine cover in great shape.I bought the boat for parts and the cover i am not in need of so if you are still looking? i live outside of detroit michigan i can send you some pictures if needed. good luck with your turbocraft there fun boats!