Slant Six

What is the code on the pad right above the coil wher the head meets the block ? I'm looking for a 66 slant 225 .That would start off with this ( B225 xxxxxx)
I got the engine into the light tonight and was unable to find any pad with a stamping on it anywhere where the head and block mate. Do you have an example picture you can send me? Glad to take another look if I know exactly where to look and what I'm looking for.