I did non functional Chevelle hood on my 91. While the hood to cowl seals, air cleaner, ect... are very expensive, the hood itself IS being reproduced (price is around $270-290.00) and there is always a supply of original hoods around. I paid $75 for my cowl hood. It was slightly rotted in the front underneath but the scoop area was perfect. You can also find repro hoods for sale at some shows that are dinged/dented/bent corners, ect that the vendors are willing to let go at a substaintial discount.
Also, the chevelle cowl induction stuff would have to bee seriously modified to work as the difference in carb to hood height is a lot...
Another FYI, the underside on the non functional hood IS cutout for the flapper door.