318 heads, 302 casting. Mystery holes?? (Solved!)

Righty Tighty said

I have TTI headers, and like you describe the flanges are one piece all across. It seemed peculiar to me, but I didn’t want to go cutting into some really expensive part without knowing whether it would help or hurt.

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I stated what I did as a side bar of information. I have a pair of 302's and I bet some headers with a small flange (not talking thick) will not cover the 302's AIR ports unless they are plugged. Those holes are just too far away from the exhaust port. Easy to see in the photos on post #1. By cutting the flange between the first, center, and rear tubes, it isolates them making them un effected by the whole flange.