Kevin, You will be pleased with that engine. The 250 Pro XS optimax engines are beasts, and will run fine on 87 octane, and premium plus oil. And, they are good on both, if you dont run it flat out every where you go!! Try the 26 Trophy first, and see what you get. Youll need about 15 to 18 hours on that engine to really break it loose, so dont be in a huge hurry to buy more props. I”ve seen about 77 on my CougarFTD with the same prop and engine. Go slow, and learn the boat. Things happen very quickly above 70 mph. Mike Whitten/Germantown, TN