I'd vote for the Volvo DuoProp. My friend that ran the Moesly 21 Unohu for 27 years went through several MerCruisers. His last engine/outdrive was a 350Chev/275 hp Volvo. He said it was a 50 mph rig. As a structural engineer, he was very impressed with the design and construction of the Volvo compared to the MC.
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