I've been out of the muscle era stuff for a while, so I'm a little rusty. I bought this air filter lid years ago. From what I can tell, it's off a 71 Plymouth. I'm focusing on the remains of the factory Coyote Duster decal for identification. If you look close at the detail pic, you can see the decal is still there, but the ink is gone. Right click the pic and open it in a new tab to see it bigger. A little bit of ink is on the lower right, and it's yellow, not tan like the 69-70 decal. Also, the upper left portion is very rounded, just like the dust cloud on the 71 decal. The early decal is squared off, which looks completely different from this one. From what I've seen, the 71 383 cars had a round lid. What about a 4bbl GTX? Would it have had this lid? Would a GTX even have had a Coyote Duster decal? I thought that was a Road Runner only deal. I know it's not a 440+6 lid because the recesses are too close together. The only other possibility is that it came off a Hemi.