Mine did have some kind of material in the void, between the hood braces and the underside of the hood. I have a gap that is slightly bigger towards the center of the hood. The braces and the hood meet just before the hood curves down, towards the fenders. It eliminates a lot of the hood wobble, for a lack of a better word for it. Footstomper, is on to something though. I would like to explore some more options, that my be more like the original material. I am one of those guys that likes the original stock way of going about restoring my truck.
Thanks,
Steve