Back on location with the chassis for a few days. Finally time to check for more matching numbers, now that I know where to look.
The hood flange for the hinge on the driver’s side had the correct numbers as I recall, though I neglected to take a photo of it.
The driver’s door number matches the last 3 digits of the chassis number. Unfortunately, the passenger door came from another car and does not.
Likewise, the engine deck lid number (underneath the grill) was a match.
The aluminum plaque that is supposed to be riveted to the trunk floor between the front right fender inner wall and the side of the gas tank, is there. Though not readable in its current condition.
In summary, it appears to be a true numbers matching car, with the exception of the passenger door.