I recently picked up a beautiful original 1969 M-code Dart GTS. Its been restored to what I call a "day after" car with just enough performance parts to make it rumble. Im thinking about bringing it back one step closer to factory and am needing a set of factory M-code 440 exhaust manifolds. I know they are different in design and different in casting numbers from the 383. However, I have not been able to nail the exact casting number down so if anyone can help with that, it would be appreciated. If you happen to have what I need for sale, let me know. Thanks! Forgot to mention, I'm in the Iowa, if that would matter.