u/Bugs_Buzy

This Pontiac Firebird is most likely a 1973 model.

The features that lead me to this conclusion are:

the front end with four round headlights and the split grille;

the slim chrome front bumper, characteristic of pre-1974 models (starting in 1974, larger energy-absorbing bumpers became mandatory in the United States);

the Formula-style hood with its twin integrated air scoops.