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Disregard the red words, I have since figured out that these holes are the exhaust ports for the EGR. They need to be plugged on a boat.

This is the back of the heads on a fuel injected 351W in a ski boat. Its the 310HP marine engine with the GT40 intakes. I'm not sure if they are GT40 heads you guys are referring to, but I cant imagine that changing the 2 intakes to the GT40 would give a 100 HP increase over stock...so I'm assuming the heads are the GT40 as well.
 
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