I wonder why even worry about restamping or rewelding? It's a 383 car. If it's documented and disclosed the car suffers, if it's done and sold, the buyer suffers, if litigated the deed-doer suffers. A whole lot of suffering going on.
Without restamping, it remains what it is, a car with replacement metal. If it's restamped it becomes what it is, a car wrapped in deceit.