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Looks as if you posted this a while ago. Anyway that is an awesome Intake with the correct heads and Carb. Back to the question - It is best not to install those Blanks, they do need to be machined to be put in and afterward they with create a turbulance in the Head. What Year is the engine? What Casting # is the Heads? What Carb are you using? And what Cam is in there? With the proper combination that engine will be pulling you into your seat Hard!
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