'70 454 cars are not worth much. We're not talking about the value difference between an original '67 L-71 and a NOM '67 L-71. I think if you're going to enjoy the car and not go NCRS with it, then there is no issue. Buy the Vette and drive it like you stole it... Maybe some modifications... day-2 Corvettes are hard to come by. But if you want to go the NCRS route, I would hope its the correct casting, CE block maybe or a blank pad motor.
If you want to send me pictures, I will let you know what I think.
-Dan
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