I'm sleeping a bit better now.
The boat has a classic air to it that says "unique, hot, stylish, sporty" and I've even heard the term "sexy". Can't realistically say that about many of today's boats. What I would do with that boat is exactly what I did with my '67 V174 - find a donor boat with newer gear and engine and do a transplant. My original engine still ran well for a 120 but the lack of trim and unavailable parts for the original equipment drove me to upgrade to newer and much better stuff, late 80's Alpha transom assembly, engine and drive. The amount of modification needed for the upgrade was negligible. A Mercruiser 3.0 liter 140hp 4 cylinder would run well in that boat, but if you're really ambitious you can shoehorn a 3.7 liter 170-190hp 4 banger in there like I did.