If the bore and stroke of the engines are both the same with 3.23x3.23 were talking about the same design with two fewer cylinders. If they can produce 350 hp with a six cylinder motor that should equate to 233hp with four cylinders and assume that the alternator and other functions may need the additional power it would seem that a 225 is possible.
Don't know about the lower unit it may or may not work.
Steve
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