You would certainly know more about how this works on an F-Body than I would - I was making more of a general statement based on my professional experience, and for every rule there are always exceptions....I hope my posting didn't appear too dogmatic or declarative (I think I said they do help but primarily when stationary)
I just took a closer look at your pictures - no front end opening makes your vehicle a "bottom breather" so yes, the flap will be helpful at speed, which I believe was exactly your point.
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