Help with VIN location on small block

Well, I thought I knew how to find the VIN stamp on a small block but I guess I don't. I have a 318 in a car and a 340 sitting in my shop and I can't find it on either of them. Can someone please describe, or post a picture of where the VIN is located on a 71 and 72 small block?

Thanks,
Bruce
(Formerly ABodySickness)