Here's the Cutting Edge, 72' Rybovich
I just asked my old boss from Rybovich Marina what she had for engines, and he said the original plan was for Deutz/Mercedes SBV12 engines, but he retired before she was built. So I looked those engines up and they come configured from 2750 hp to 4350 hp. So who knows? I wouldn't want to pay the fuel bill. My F-250 diesel is bad enough at 17 mpg.
At 51 kts, the hp has to be up there. Remember ALL Rybovich sport fishermen have wooden hulls. (Or at least that was true up through '84 when I worked there).
At any rate, I hope they last longer than the Caterpillar 3208ST's in my doctor's 31' Bertram "Fish Oil". It's fast, but boosting a little 3208 to nearly 600 hp is insane. I know from experience that any 3208 pushed to over 400 hp loves to eat piston domes. So far, he's got 250 hours on this his 3rd set of rebuilds in 7 years.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury