I have a early 70's 14ft Montgomery Ward aluminum medium v boat with a 60", width on the beam, and a rebuilt 15 1/2" Transom with 1" ash and a 3/4" oak kicker on the back, It does not have a plate on the boat for a rating on hp. It had a 9.5hp evinrude short that weighed 67lbs, I want to put a...