Do you know about the VCCA (Vintage Chevrolet Club of America)?.....same as the AACA, except Chevrolet only.
I have Preservation awards from both, but they judge the same way....correctness / cleanliness. Both orgs really don't care about #'s matching, and I wasn't too impressed with the judges at these events.
I found the judges at the VCCA / AACA events totally inept in Camaro specific items....they think whats ok in an Impala should be the same in a Camaro.
Personally, I think a cert from the Camaro Nationals means more.....IMHO.
But they do have a nice little oval thingy to put on your grille....makes you feel important. Sorry...I digress a little....

What maroman said on the second thread pretty-well sums it up.....