Right, if it was an N, that would tend to make more sense, but based on spacing it seems to be a 1.
OK, so I went back and took the "Joe Friday" approach to this. What do we know?
JH code was supposedly only used for Camaro and Nova.
If the third stamped digit is a 1, then it would have to correlate with the Oshawa, Ontario Canada plant.
But from what we know, there were no Camaros or Novas produced at that plant.
JH was apparently not used for the Chevelle, and even if the stamping was 191355092 that still does not work
for a Chevelle (the JH code is not right for Chevelle either).
Full size cars ilke the Caprice were assembled at Oshawa, but nobody knows of any getting the JH engine.
Kurt, does anything look "disturbed" on the front pad stamping? Do you think that mark between the 2 and the 9 is
just a contact mark? I looked under high magnification and could not say anything looked "bad" on the front pad.