I have found two more numbers on this motor. One is just left of the oil dip stick - f523j. On the driver side in casting just under the rocker cover just before the carburator - 3836848 and under this number is GM25. I came up with 1 ton off of the vin#
6fsh2035. Is this right and also it sounds like I do not need to have a oil filter on, is this right. Oilrag you said something about AFCA & AFCM -- I have not found those on anything to this point. Sorry to be so uninformed but this is my first48. Now I just have to figure out how to put on my pictures. Thank you all for your input. This is a great site and great help.