I have a '95 268 Islander w/ twin '95 Johnson 175's. They weigh ~375# ea, boat is rated for 400HP Max.
Considering a pair us '99 Yamaha ox66 225's. They weigh ~500# ea.......that's an additional 250lbs hanging off the back, no too worried about the additional 50HP.....never ride WOT.
The '95 200...