Dual single scoops? Yes they can be added by anyone, the underside of the hood was exactly the same for the '72 hoods and that includes the holes and reliefs in the bracing needed for the '71 twin scoops.
But the factory codes would have been for the snorkel scoop and the '72 style blackout. If the dealer added something the codes wouldn't be on the fender tag or build sheet.
