Thanks guys.....Great link.
It looks like the aircleaner is the same for 383 and 440 for 1971.
The one I'm looking at is painted orange and is supposed to be original.
It looks to be a 1970 unit.

I saw your listing for the 1973 340 aircleaner.
I have an original one stored away that I've owned for close to 30 years, no flap.
It came off an original 1973 340 Dart Sport.