I have 1977 Cobia Sportster. It has a 120hp i/o OMC. This is my first boat. Been trying to find as much info on the hull, and what she looked like new. I have exhausted all known possibilities. Even this site does not give info. I love the amount of power it has, and the maneuverability. I recently rebuilt the stringers, bulkheads, and transom. If anyone can help with some info you help will be appreciated. I have more photos of the boat, and the build if interested.everywhere i look in 77 all i see is outboards no i/o for an 18 footer.