in most cases, usually the one that came out first, ends up being the more hard to find one... not in all, but in most cases...
having said that, and not researching every list or e-bay auction out there, I'm sure on the Camaro, the regular, red or non-white hood was the first one out, then they changed it to a white hood...now the white hoods are all over the place, being left to hang.... also check the side vents in front of the rear wheel... the first ones out..(hence-harder to find..) had them painted silver.. that went away pretty quick...so... seems the hardest to find would be regular red hood with silver painted side vents... next the regular red hood without silver painted side vents...then the most common..the white hoods...
now on the V-16..I've seen both, but I think the black was out first..seen alot more of the silver....
hope I could help a little...