Not really... But I always felt like I had to trim it way down in rough water to get it to ride good... Calm water and I can trim it way up...

That there is a really great idea... Never thought about that! And it's not like it's worth a ton of money so yeah great idea

Is there room lengthwise?

Make sure you take that Bimini top off before you get it all revved up. Hah

http://www.go-fast.com/boat_speed_predictions.htm

There is... A v8 was an option for the boat

ok...

That calculator doesnt really account for slip so its a little optimistic but close.

What prop are you running now?

Also idk how light that boat is, but I had a maxum that went over 60. It didn't chine walk bad and handled it pretty well. The only problem I found is when going that fast and hit much of a wave it would get air under the nose and start picking it up. It would lift enough you had to back off the throttle slowly or it would flip. 20 foot open bow boats are usually pretty light so just be careful to get to know it when it's done.