I don't believe the insulation is correct for a 'flat' hood. It's true, very few Z/28s originally had the cold air hood but it seems all of them have one now. When I bought my Z/28 last year it had a GM ZL2 hood on it that was added back in the 80s. I bought a used flat hood, painted and installed it. Now it looks like it did from the factory.
Wow, just noticed that this was my 69th post. My favorite number
