"Ideal" power for a 20' '87 Superfisherman?

[Snookerd]

I only have this shot from the Sebastian trip. This is a 1987 18SF with a 140Suzuki. Notice those 3 heavy weights I am standing next to............. ......When the Zuke salesman says you can put 4 people in the back of the 18SF and still be able to have the deck height above the water line, this is what he means