There is a MAXIMUM HP limit on your boat. It should be on the yellow Coast Guard capacity sticker on the boat. Don't go above that, although many do. Most marinas will not hang a motor with a higher hp than what the boat is rated for due to liability reasons....
Its probably wishful thinking that you will go 50% faster... but you will se an increase, and it will be better at pulling the kids on tubes. You will probably want to stay with a Johnson/Evinrude, just because thats what you have for controls & wiring.
Woodsy
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