That is NOT a 1977 ‘Bird decal on the spoiler. Its a ‘79... 10th Anniversary bird? Decal? ???
Currently trying to find more info on it. Besides the sail panel bird emblem:
It was the only Screaming Chicken on the outside of the car.
Which if it HAD one on the hood it would be this one:
That doesn’t match what’s on the spoiler, and I can’t find any replacements that size, or images of 1977-78 Firebirds with that style bird on the spoiler. Hmm...