I have some generic Marinette diagrams on my website under "marinette" along with some other information that might be of use. I am sure that if you get good photos of your engine, someone will be able to identify it. http://web.me.com/dougmrose/Doug_Roses_Website/Welcome.html
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida