It's a SAILboat. It is intended to be SAILED. What you obviously want is a POWERboat.
Seriously. Whatever your spend on these monster engines, be aware that when you get around to selling the abomination that you have created, NO ONE is going to want it. People who are looking to buy a SAILboat are going to consider your ridiculously over-sized engines to be nothing but a liability, which will have to be removed and replaced with appropriately sized engines. They are going to want a MASSIVE discount on the boat to account for the hassle you have created. And people who want to go that fast are not going to be dumb enough to buy a SAILboat. They will be buying
So the only smart thing for you to do at this point is to sell the boat you have, and buy one that is actually intended for powering at higher speeds.
Good luck, whatever you end up doing.