Well the mercruiser 454 is great. So glad I switched. It really purrs and we are about to do a sea trial to determine the prop. I'm having all new switches retired on the dash so it's been gone a couple weeks. I decided to stay with the alpha one for now and then if the 454 chews it up ill replace it with the bravo drive. It's so crazy how spending money on my boat is so gratifying. Lol