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The 4 would just be an easier swap, because of the length. The 4-71, at 284 inches, makes the same HP as a 568 inch 4 stroke. The 4 strokes generally have more torque. A 4-71 would give a higher top speed, I seem to remember them turning close to 3000 rpm in the boats. Now, if they just didn't...

Also, the Hypercycle engine was specifically designed top provide a slow, even, burn with a wide variety Cetane of fuels. The pistons have to be fairly heavy to accomodate that deep combustion chamber. I believe a purpose designed Diesel engine can provide more power than the Multifuel. But...

The LDS 465 book states that "the crankcase is made of cast iron. It is designed for maximum rigidity by extending the sides of the crankcase below the centerline of the crankshaft. The main bearing caps are provided with maximum support by recessing them into transverse webs which are cast...