Since this is a wing car with not generous air coming in grille, I will ad a chev dealer experience from mid eighties to mid nineties. The v-8 camaros sometimes came in with highway hot running issues, and we found it was usually the cars with 4 bolt-plastic lower air dams broken off or removed that caused it. Plain as day. On them things, it was an important component from factory. Don't think birds or daytonas are equipped with such a thing, just saying.