Just to add to this thread, here are some photos of the data plates of this HUM.
Dash plates
Body tags
CHRYSLER
SERIAL-NO
MACH-ZL-1-087
I am a bit puzzled about these though. While the Chevrolet plate says that this is a ZL-2, the Chrysler plate next to it clearly says ZL-1. I would love to see what other ZL-2s plates say. Maybe all Chrysler plates are ZL-1 and only the Chevrolet plates got the update?
Also interesting to note: My dash plate also has the C stamped in the upper half. It is stamped right on the 'M' from 'Vehicle Model'.