WIW 1971 Duster H code 4 Speed.

Any proof of this, I thought the twin scoops and dual snorkel were options even on the 340 cars ? ... so every 340 duster(70-71) with scoops was added after production ?

J54 is the sport hood code. Go to Hamtramck-historical.com and look at the Duster 1970-1971 option code books and you'll see no sport hood option available on 340 Duster.

Yes they are all added. Just a matter of drilling holes. And notice scoop location varies with these bolt on additions. Some look downright goofball.