Front bumper doesn't have the Pontiac arrow nor are the filler panels there which suggests to me that it either wasn't an original 400 car or was in an accident with front end damage.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
