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The Vortec heads work great for a mild 350. I`d add a little more camshaft while you`re in there.

Did this on a friends 20' bowrider a few years ago ---

Vortec heads
RPM intake
600 Edelbrock marine carb
Comp Extreme Marine cam

---- picked up 5 mph top speed and much more low-end torque.
Had to swap to next pitch up on prop.
 
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