Color change on muscle car

[Too Many Projects]

Painting a car to remove ALL evidence of the original color would require a complete disassembly and every bit of original color removed or covered. Without that, there are places the original color can be found and determined from.
Even with a nut and bolt, complete, to bare metal, restoration in a color of the owner choice, as Tom said, without original documentation or historical records, the color could always be in question as original.