The Seacraft 20 goes well with the 140 hp. I have that on mine and find a nice balance of power speed and economy .A Friend repowered with a 175 hp and soon went back down to 140.I see a guy with a 200 around Buzz Bay frequently and he really flies at about 55 or so, but not good when it is rough, and the weight seems to put the transom too low.
Hope this helps
Dave A