1968 Dodge D200 with a 318 from who knows where

The VIN on a 68 Motor and transmission is stamped on the top of the flange where the motor and bellhousing bolt together. It's usually kind of down behind the distributor. No VIN's were stamped below the head. Later than 68 VIN's stamped on motors was stamped into a machined pad on the passenger side of the motor, just above the pan rail and near the block drain plug. You will have to scrape it and wire brush it to read the stamping if it's all gucked up with grease and grime.