The dual snorkel scoop was first offered as a factory option only on '72 Demons and continued only on Dart Sports in '73 and possibly '74. I bought one off of a confirmed '73 318 Dart Sport that had the hood stripe option with it.
74 dart sport 360 had them too. Also 72 swinger special 340 cars.
my 74 sport 360 car Had Factory alpine white paint, black vynil top, with black hood treatment and scoop.