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Remember, this group is dedicated to the preservation of old outboards!
An old engine rated for 30hp at the crank might deliver 24 to the prop.
You didn’t say how much you use the boat, and what condition you keep it in. I ended up here because I bought a vintage boat, and vintage power was a no-brainer in terms of price, and keeping the boat period correct. But I spend more time tinkering with the boat than running it. If I used it every day, I might feel worse about what the engine spews (and/or the cost of biodegradable oil).
Parts are available, and your old engine is a testament to a time when things were built to last, and OMC made engines that ordinary folks can work on with ordinary tools.
http://www.omc-boats.org
http://www.aerocraft-boats.org