I know jack all, but a 23 foot boat is quiet a big boat unless its a boat like a ponga, if its adeep v hull wouldnt u want to know your not laboring the engine going the v6? The v8 should stand out its like the roles royce power and class v6 225hp v8 225hp i would pick the bigger cubic inch just the torque should speak for its self
If the boat is a ponga anything will move that
Interested to know what kind of hull it is tho