Looking for an engine that would roplace a mercrusier 188 in a Sea Ray

My son has a 1983 Sea Ray, There is a 488 Mercruiser in it. it runs pretty well however we are getting what I think is called blowby .(oil flowing past the rings) Checking on line I noticed nobody will work on them and parts are hard to find. This is why I was thinking of replacing it with a little more horsepower. That of course is if it will go into the Sea Ray with little or no extra work having to be done. Any help you could come up with would be appreciated

Thank You,

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