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No. A 4-108 is a great, easily serviced and common diesel, but it's neither light on a horsepower per pound basis nor is it particularly economical. It is best used where you anticipate motoring at a constant, not particularly high RPM (say 2,200 or less) for hours and hours, inferring a fuel supply to feed that. The smallest boat I've seen one in was a 36 foot full keeler, and I've seen most in 40 footers.
You are far better off with a 20HP or less diesel or a rebuilt Atomic 4. If you can acquire a running Perkins for peanuts, I have no doubt that you can trade it as is for a newer, lighter, and more appropriately powered engine for your needs.
From what I recall of the C30 engine space, if you could even jam a 4-108 in there, you'd need half-inch thick fingers to service it, and it would melt the glass with its fiery warmth.
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