josh our boat is like 20 something years old and so is the motor, its one of them old tri haul designs, I can't even find replacement propellers for it
my boat is 20 years old also. I have a 115 hp and get 56 mph or so. Also have an 85 hp motor that I got for next to nothing and get 40 or so. This is with a 2500 lb boat.
what kind of motor are you prop shopping for?