Repowering a 23' 1986 Sceptre with either a 250hp

[Kurts1953]

Optimax or 300hp HPDI Yamaha. Or should I say I am thinking about it. My dealer is telling me that they would run about the same amount installed (Yamaha is a little more). The 300hp Yamaha per the specs in the book is about 40 pounds heavier than the 250hp Optimax. I am leaning towards the Yamaha but I am wondering if this would be a bit to much power. I have the standard transom (no bracket). Does anyone have any thoughts. The boat is currently powered with a carbed 225 HP Johnson 1996 which just eats up the gas and oil and pushes me around at 25 MPH at 4200 RPM's. Do any of you experts have any thoughts which is the better choice.