superbee6, have you physically seen the car and checked the VIN?
The 3 main VIN locations for your '70 Challenger are the plate on the dashboard, on the top of the cowl just to the driver's side of the wiper screen opening, and on the top of the radiator support.
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My '69 Dart also had the VIN stamped underneath the rubber trunk gasket but I'm not sure this location carried forward to E-bodies.