Unless the hull is a specialty racing model rated for that horsepower, you will be illegal in most states. Will the engine be physically too big? maybe, maybe not. In the past I have had a 14 foot flat bottom upon which I hung a 125 and did 60. I do have a 5 cylinder Force 150 which I will use on it when I get the engine together.
You do need to be careful though: There does come a point where weight and horsepower DOES become too much for the hull and handling is adversely affected. The hull will become dangerous at speed.
Of course, you must also remember that you simply can not hang the engine on the transom and expect to go fast. You MUST logically look at the hull and reinforce not only the transom but other parts of the hull to handle the extra stresses of the engine and speed--otherwise you will find that you, the hull, and the engine become "swimmers." Yes, I have had different overpowered hulls upside-down a couple of times. It happens fast and I was lucky. No one says that you will be lucky too!
Back to the 14 footer with the 125: I reinforced the transom and deck, rebuilt the stringers and floor, added extra cross braces to the floor, built very rugged seat mounts, and glued the cap and hull together. Even then, I spent about an hour running at 60 then went home and spent several hours re-gluing the hull.
Now, I can't recommend that you actually overpower your hull--the other members of the forum would have a fit--but the decision is ultimately yours. Just be aware that without proper thought and equipment you are getting into a dangerous situation, both to yourself and to other boaters in the vicinity. You know that if you put an engine that big on your hull, you have no intention of trolling with it. We all know what position the control handle will live in.
