The back half should have the p/n and assembly date stamped here.
View attachment 1715421114
IIRC There's usually one digit difference between the assembly with the pulley and without. You can look in Hammtracmk Historical Library for a service bulletin about this.
Casting date for the back will be on the 'ear'. This one was sandblasted.
View attachment 1715421115
Might be the same location oin the front halfs.
edit: Yes. see
mmcdetroit.com/ICCA/References/Engine_Compartment/image_32.html