Looks like this guy did. Not sure what year your boat is or if it has the enclosed transom or not but the max horsepower for a 1992 GW 25' Sailfish is 400hp. Not sure how a motor with 100hp less than the max would handle but I'm sure it's been done more than once before.
1987 Grady-White 25 Sailfish Walkaround Fishing Boat in fair condition. Explore very detailed descriptions, features, prices, photos, and video on Pop. Located in Pensacola, Florida (near Mobile, AL). Contact us today!