A 6" will help in most cases. But it is hard to determine without having set up that exact boat before. I will sometimes look on bass boat central to see if I can find if someone has already done the leg work by looking at several set ups on the same model boat. Most of the time you cab call the boat manufacture and they can tell you exactly what you need to know like how big jack plate, prop height, and prop. They can tell you what you should expect in speed with what engine.
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I have plates and adapters to turn a 6" into a 8" or 10" plate. Normally, you add a 6" plate and see how it runs. Then add the 2" spacers and see if it likes it or not. Then add the 4" plates and see how it runs. Which ever runs best, you add to your existing plate if it wants more than the 6". Hope this helps.</p>
