RE: Need to repower.
Can you do a marinization?
The Iveco (fiat) would also be a choice.
Volvo may offer factory rebuilts , might be worth a call.
I would opt for the simplest newer engine that would meet any local air police rules.
Electronic engines are great about 15% lower fuel burn, BUT a nearby lightning strike may cost a $6,000 black box or (6) $1000 each injectors.
Same with a turbo , great IF the engine is small enough to actually load the turbo at your LRC cruise speed , otherwise just another expensive maint. item.
I would use your existing knowledge of your boats fuel burn at various speeds to determine what you actually can use to cruise.
Find the MFG 24/7 hp chart and see if you can match it to your old fuel burn , use 15hp from a gal an hour in estimating the hp produced by your old engine.
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