I have a 1990 Bayliner with a 3.0L OMC I/O that fairly rapidly adds water to the oil. Haven't had a chance to look what's the issue, but I'm sure it's nothing good. I also have a mostly complete mid 80's parts boat with a 120 HP 2.5L mercruiser I/O. I've almost finished rebuilding the 2.5L engine with a friend. Is it relatively easy to swap the 2.5L mercruiser in? I have essentially all the engine and out drive parts from both boats, so using everything from one or the other, or combining parts is possible. I would prefer to keep the out drive parts from the Bayliner as I'm pretty sure they are in better shape, but I'm game for anything. I also have a bunch of parts from a 3.0L mercruiser I/O if that helps with anything. If it's a do able swap, I'd really appreciate any detailed instructions that anybody would care to share. Thanks in advance for all advice.