Hood louvers / vents on a '57?

[yossarian19]

I've had my truck together and running for a little while now, cruising around and getting little fiddly things dialed in. After getting my toe-in set up right it drives pretty well at 70-80 mph - but the hood drums pretty badly in the wind at that speed. Like, I can watch the sheet metal bouncing up and down a good 3/8" in the middle, edges staying put. It needs a vent.
Anyone have pictures / practical experience on this one? I can't decide if it would look cool or if the hood has other problems (missing bracing?) that is letting it flex / drum the way it is.