I did a quick search and that hood type was pretty rare when those sleds were new, so finding one that's serviceable might be about the same as the rear window in a '60 Bonneville Bubbletop . . Y'gotta buy the whole car! And then fix the dents your "new" hood . .
And while I don't know how long those louvers actually were, they look to be at least 4" and that's gonna be tough to find someone who's got a set of dies that big, and then to keep from screwing up a hood or two when punching them . . The two rows are very close together and will tend to "pull" the sheet metal towards the centerline of the hood and end up with a "Twist" right between the two rows . . The bigger the louvers, the more of a pain in the @ss. The only saving grace is there isn't very many of them, Five in each row, I believe.
Probably be bucks ahead to just fix the one you have . .