Repowering could cost a lot more than you expect. Unless you are lucky you will have to rework the engine beds and as others have said buy a new transmission. The higher horsepower will likely also require a new shaft and you will certainly need to at least repitch the existing prop if not replace it. If you have to go to a bigger shaft a new prob will be in the works. You could easily spend more on the things above than on the newer engine.
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