72 demon 340... again

I understand the car is missing the build sheet & fender tag - that's not unusual.

You say the vin has an "H" code in it - great.
Now does the door tag and/or body panels (radiator support/rear deck) vin #s all match that vin?

More importantly -- does the motor and tranny vin #s match that vin tag?
All of these things will confirm if it's a real 340 car..and if it's a numbers matching motor/tranny.

The build sheet or fender tag are not needed to confirm this much.