I can understand why you would want to pick the parts that go into an after market set of heads but those ports have been designed to give you just exactly what you want. Any porting would no doubt upset the flow characteristics and leave you with garbage that you could have had by doing a poor porting job on stock heads. When you spend good money for after market heads buy the porting you want don't mess up the porting you buy.

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions