I once did almost 100 mph on the water, but it was also a boat that was made for it at 28' long with dual 454's.
Being only 9' long and a 4 cylinder between your legs sounds a little spooky. haha
I bet the "whistle" is almost deafening under full load not to mention the exhaust coming out the side.
I think the acceleration would be the best part to play with. Not so much the speed.