The 440 is taller so the linkage rod that goes down from the top bellcrank to the bell crank on the side of the trans may not have enough adjustment to be used on a 440 if it's on a 383 , otherwise the other parts would be the same., that's till about 71 , after that the factory went to a one piece linkage and the 383 and 440 part would be different.

Good luck finding that stuff in a junkyard in 2015 ...