Looks like a Harms Challenger hood kit, no others (ever) had the same details. The give away are the spot welds as compared to an original, on the above hood they appear wrong. .02

*Edit, after a closer look I'm not 100% sure about the spot welds looking wrong, however I'd need clearer/closer pics to make a final call. The small welds at the edges are what don't look typical of a factory example. There are also two non factory holes in the 2nd pic of the blue example above, possibly from an older modification that the restorer missed (should have been filled). Maybe the brace was R&R'd by someone doing an older rust repair or similar which would require welding it back on resulting in the non factory looking spot welds.