Unfortunately, that also disrupts flow over the sides of the hood toward the rear, which no longer transition smoothly to the tops of the front fenders.
Aerohead did fiberglass work to the hood of his truck to raise the rear, while preserving the smooth transitions at the sides. If memory serves, I don't think he was able to detect any improvement. (Though it makes sense you should see some if you achieve a cowl-blocking effect, or more effectively hide the wipers.)
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