I'm looking at getting a 1994 Apex Inflatable RIB with a 1994 70 HP Johnson on it. My concern is that it has spent it's life in Annapolis MD, and obviously has been in saltwater. Am I looking for trouble in buying an engine that has been in saltwater for that long? The motor looks clean from the outside, but that has no proof of what the cooling system is like. The dealer said it pumps good water, and he sent me a video of it running, but my concern is that the engine will need to be repowered in the next 2 to 3 years. any input?