I have a Yamaha F100 on mine and it is a little slower than that. But 5-6 miles/gallon, and when I raise the motor one hole, I think 35MPH top speed.
Details are here:
http://www.classicseacraft.com/commu...6&postcount=28
My outboard will hit the spalshwell door when trimmed all the way up, but some have a door with a hinge in the middle. I am going to put a bulge in my splashwell door when I glass a new one. I was hoping Hermco would make one, but I don't think he does.