I'm NOT an expert on the subject but I would be VERY hesitant to mess with the porting in the head.... there are bad things that CAN come from that such as fuel not staying atomized at low rpm (IE loading up at idle or low speed) or losing low end torque (which is vital for a boat) to gain top end and you are building a lugger not a 1/4 mile screamer..
just my .02
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