Check out this dealership and the Demon for sale

As far as i can tell, they are not representing it as a real 340 car, as a matter of fact, they posted a picture of the fender tag and it tells you that it was originally a '71 Demon slant six auto, light blue with a dark blue interior. A pretty plain jane car originally.
How they bought it and what they sell it for is their business.
JMHO,
Tom.