If you are running a console shift, then the linkages should interchange, they did for me when I swapped a 727 in for a 904 on an e-body challenger...
If you are running a column shift, the shift linkages for the 727 are different from the 904... Z-bar, bracket for the z-bar that bolts to the trans, the bracket for the trans lever, and the linkage rod are all different... I'm going through this on a 71 Valiant...
