I changed the picture for a better one, the original was very small and low quality...
I would say 3 stars, maybe because it carries a bomb and then explodes four stars...
1977 models still had exposed bumpers. Early '78 models, however, still used the older dashboard. It must have been a midyear change (for the worse, imo)
The hood scoop and fender vent were the Z-28 pieces used on 1978 and 1979 models.
The 80/81 Z had a different style fender vent and a different style hood scoop with a rear air inlet and a solenoid that would open it.