I bought a 29 "coupster" this last monday so now begins the fun part of gathering parts. A friend of mine told me about a Buick engine in a boat that I am going to look at tomorrow. He told me he thinks it's a Nailhead. Said it was the original engine and its a 60s model Evinrude he believes. I know a lot of boats had buick V-6s but a Nailhead?? Can anyone help clarify this for me? Thanks in advance.