What up with apparent fake 428CJ’s?

Been looking at a 428cj q-code frankencar looking like a 69 with a 70 6 cylinder vin. Anyway a few sites have 69 R codes for well under $30k ... sites like Hemmings and Autotrader have the cheapest at $65k and many over $100k ... other than not contacting me back what’s up with the glut of inexpensive r codes on some sites?
 
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Is he trying to pass it off as a real R code ?
People like to build a car the way they want it and not the way someone else thinks it should be built. If he is trying to pass it off ,that is wrong .
I like to build coupe to fastback conversions ,they are listed a such . This seems to upset people but i dont care ,i am not building it for anyone but me .
It would be like saying ,you should not build a fiberglass Cobra or any custom car.