I have a 1981 2.5 litre GM OMC paired with a stringer 400 outdrive. I am looking into a boat with a good Cobra drive, in need of a GM 2.5 litre motor. Is this a difficult swap? <br /><br />I am aware that it mounts differently, but does anyone know for certain that the bolt patterns are the same? Everything on the cobra drive boat is in great shape, just want to make sure I can R & R all the mounting parts etc. Appreciate your help.<br /><br />-Jeff