73 340 V 21 code

Locomotion said
'73+ Dusters never had a factory scoop option. But it's a popular add-on.
(Edit: However, the "Twister" option appears to have been available with a couple of little non-functional scoops. Not a common item.)

BTW, Those “Twister” dual scoops are the same as 69 ‘Cuda.

I believe the hoods were blacked out to go with those black scoops.