And now, back to what's important.
Do you even need that much power for a fishing boat?
The boat has to be stationary while fishing, and with those nice ladies on board you have all the time in the world to go slowly from the harbor to your fishing spot.
I would save money and just use a paddle boat.
Just a guess but I bet you could buy a pretty decent house in central Indiana for what he has in those engines.
Actually probably a pretty decent house in South Florida as well.
https://www.boatingmag.com/crank-up-performance-volume/