The 75 version of the MPC I have lists
for 67 Mustang without the hang on AC as C7OZ-8A616-C - stamped with C7ZE-B 2.91" depth
This same one in the April 68 version is listed
for a 67 Mustang 289 without the hang on AC built after 2/27/67 C7OZ-8A616-C - stamped with C7ZE-B 2.91" depth
The April 68 version listed
The one stamped C7ZE-A 2.91" depth was used/service replacement for the 67 Mustang with 289 without the hang on AC before the 2/27 date
Not sure why Ford changed
Picture from another thread but it includes information related to this thread also