That and the wiper motor, the rear interior panel looks to have a hole for the seatr belt like in 1974, etc...
Front bumper has been changed, along with the wiper motor.
Hole in rear panel appears to be the bezel for an ashtray, making it an earlier production '71.
'71-only primary hood release is there, hood hinges appear to be '71s (though my eyes could be playing tricks on me).
Belt moulding present - so GC or 'Cuda likely.
Disc brake car too....
But rusty. I had a gold '71 383-4 Gran Coupe that broke into 3 pieces when lifting it out of the field. But even that was nowhere near as rusty as the car pictured here.