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?