I found the number cast into the head. It is either "844845" or "B44845". I couldn't tell whether the first number was an 8 or a B because of the rust. The number "850" is cast on the head just below the number mentioned above. I can't tell what the number above the starter is, I'll have to pull the starter off to see it. Thanks for the help.

http://www.picturetrail.com/highschoolhauler