The most catfish-like car, IMO, was the 3rd generation Camaro. Particularly the ones with the gray upper body paint combined with white rocker panels and front and rear skirts/air dams. That body shape combined with the "fish belly" color combo was most repulsive. All it needed were some curb feeler "whiskers".
I was only thinking about current production cars, but your Camaro certainly is right in there with the ugliest. I remember that two-tone combo you mention. I doubt any have survived without a repaint. The first generation Camaro was a great design, and the second generation (with the metal bumpers) was really good too. Ford went through its dark age with the Mustang, and got its act together again with the current versions, modernized, but with the spirit of the original fully intact. Chevy made an attempt with the latest Camaro, but they fell short. Maybe next time they will get it right.