Re: MAX Hp Baretta Phaser 230
It's hard to predict what the boat will do at that speed. I've also thought about the stroker for my boat if my 350 were to need replacing. I ran across this post the other day. Have a look.
http://forums.iboats.com/boat-topics-questions-not-engine-topics/anyone-know-boat-625316.html
It seems that some of the guys think 65-70 mph could get a little dangerous. but who knows.
Your boat has a fairly shallow v hull and I would expect that is would really fly with that much power. For a lot less money you could put in a nice 350 with roughly 300 hp and still go 55-60mph. My boat has a much deeper v and will touch 50mph with my stock 350.
Not only that, but you would probably need to have a custom prop made since you cant buy more than a 23p prop off the shelf for these old outdrives.
According to my prop calc, you'd need to spin the motor up to 5000rpm with a 25p prop to hit 65mph, with a 10 % slip.
continuousWave.com: Whaler: Reference: Propeller Calculator