You got my curiosity up so I started looking through one of my Cobra books which has several pictures of original S/C's. There is a mixture of the silver & black emblems as well as the red,white & blue emblems and they seem to be scattered throughout the CSX numbers. For instance, CSX3021 - black & silver, CSX3025 & CSX3275 - red,white & blue. I only see the A/C emblem on one 427 car but it had European license plates, so possibly a COB/COX car. All other A/C emblems were on the 289 cars.
Well, I guess that should make it all crystal clear for you
Ted