hmmm ...
It's got a soft nose and no rear chrome therefore not an "original" '73.
It's wearing Stingray badges and has a round "sunburst" logo on the nose, correct side gills and correct rear so it could be a '74 ... however, the side view mirrors are chrome and it's not likely that someone would remove the '74 plastic and replace with a previous model, but possible if they were going for a "chrome" look. There are also no over riders so again not standard '73 or '74
Bonnet is long style, small block consistent with '73 & '74
Of course if I were seeing the car in person, I'd check the pillar serial number ... but I'd say it's either an "artists impression" (the lighting looks suss to me) or a customised '73, 74 or '75. My money's on customised '74.
Definitely not a '77 and of course side pipes are custom as mentiond already.