Hello, I got a 1956 Evinrude 3 hp Lightwin model 3018. The head gasket at NAPA says it's for '57 and up; but has the same OMC number as my '56, 203130. Is ther any reason this won't work ? Also does the cyl. head have a up and down , it looks the same either way, just thought I'd check with the pros here first. -Thanks