The fenders look like 13, the side lamps are 13, the 14 style body came into use about August 13 - the original 13 body style had some serious problems in the rear door area that, after several attempts to improve it, was replaced by the 14 stlye earlier than planned. The 14 style windshield was likely introduced at the same time.
The hood is definitely later but that is a 10 second change . Obviously a previous owner did some upgrading on the car & louvers might be an improvement. It also
has aftermarket shock absorber devices.
The engine number will be a clue as to when the car was built.
In any case it is a great find & will be a lot of fun just as it is!