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Holley 300-66 intake manifold issue.

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  • Holley 300-66 intake manifold issue.

    I recently installed the 300-66 intake paired with the Holley 670 TBI. I’m having trouble with placement of a few things. First, the EGR valve will not fit, it hits the IAT. Second, the heater hose placement. The stock location on the 300-66 is a 5/16” port would this be sufficient or should I move to the larger one in the front. Lastly, vacuum lines location. Any help would be greatly appreciated.
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