I doubt you will be getting anywhere close to double the HP...like Ferm said 150hp vs probably close to 140hp out of the Merc.
TowerOfPower Mercs were notorious for putting out more power that the sticker showed, at least in my experience.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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