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About opening the vent window sticker at those speeds 427TJ you would be wrong. My brother had a '64 SS 409/340HP with super tall gears and 4 speed. It would do about 150 or so. As the speedo did not go that high it was a conservative estimate. I borrowed it in '66 on my wedding day and questioned him about the broken headliner. He told me he was smoking and opened the wing window at about 140 and it sucked the headliner down and broke the bows above the back seat.
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Wow!
I'll bet that made a hell of a noise!