Just like almost all factory sheet metal from the time period no year is included in the stamping pattern. This is also covered in the Decoding article in the Library
Pattern = Month - Day of Month - Stamping Plant - Shift
So for a hood only the frame is dated. Location can vary depending on the specific die used and the time period
No engineering number was needed on original units since they were going to the line and carried identifiable features in the cars deluxe or standard visible features that the worker could identify and place in the coded BIN for the installer to locate