In New York State, it is illegal to stamp a VIN number anywhere subject to confiscation of the vehicle. If an engine is changed and given a new VIN to match the number on the frame, the DMV in New York must have eyeballs on the frame number. Rubbings and photos are no longer usable proof.
There is a high probability that a new Model A will be registered as a 2016 Custom if the motor number changes.