I bought a parts car for my 85 Z.
On it is a fiberglass hood that the guy swears is factory.
The "ducts" are open at the back and there seems to be a place for doors back there.
I remember seeing only one other of these hoods about 20 years ago.
I need the doors if they are available.

 

Year one should have them. You'll have to call. I couldn't find it in any combo of searches I tried. I think your talking about the forward facing L69 hood flaps that open at full throttle.
http://www.yearone.com/

800 932-7663