Can't find VIN# on engine

An 11/68 casting is NOT a 68 engine. Most likely a 69, but occasionally leftovers were used in later years (more likely to happen with a 426, though). There is a machined pad right above the pan rail where the VIN will be stamped. What is stamped on the boss in front of the right head?
The machined pad above the pan rail you speak of and I read about in the manual is on right side (passengers) correct?? I scrapped paint off the length of the block at the pan rail. I didn't find a machined area or stamped numbers . . . .