[Bushwacker]

The one metric you should keep an eye on with a heavy motor is min planing speed. These boats will plane at 12 mph with a 300-375 lb motor because that's what they were designed for. Mine will even do that with the 427 lb E-Tec and a 30" setback bracket, but it took a stern lifting prop and Doelfin to do it. A 500 lb motor will probably hurt min planing speed and ride.

A 150 is plenty of power - my Seafari, which is several hundred pounds heavier than the cc's, will run low-mid 40's with very heavy load and all the canvas up. Will hit almost 50 with light load and the top down. Will average 4 mpg heavy, 5 mpg light at about 3700/27 mph.