could you post up some pics. of your boat so we might be able to help you(top , inside , back , side)by the #you say its a big plug so you might have a g23.a pum260 has a little more power so that boat might go a bit faster with a pum260(stock)you can get some upgrades with this engine later down the road so you can get more speed out of it(top kit , stroker crank 1mm and 2mm , header & pipe, better carb and a few other things.there or boaters on here that will help you , just ask