Stop in for a cup of coffee

Bills65Dart said
I can get remanufactured round backs everywhere. But, to be totally honest, and honesty last the longest I learned as a kid, I think I would rather have an old and even dirty one that I can take apart myself and overhaul and put in my car. That would really please me.

Bill

The back half should have the p/n and assembly date stamped here.

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.

Might be the same location oin the front halfs.
edit: Yes. see mmcdetroit.com/ICCA/References/Engine_Compartment/image_32.html