Hey guys, just a three months ago I had bought a 1963 16'Mark Twain with a 75 hp Johnson. And just yesteday I sold it and bought a 1968 Mark Twain with an I/O. <br />I took it out on the lake and "oh what a feeling!" This thing runs like a champ. The power difference from the other boat is like night and day. I still can't believe this guy sold this baby to me for $600. It was taking up his entire two car garage up and he needs to put a Trans Am in it. So he can drop a new engine in it. The neighborhood asso. won't let him keep it outside.<br />But now that I have it I need to know a couple of things. Where is the model number for the motor? I I know its a Mercruiser with four spark plugs and a big ol' propeller. Does Climers make a manual for this? Or is there another brand of manual to look for? YOur help would be greatly apreciated. 