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IMO,That car no longer exists.Only its parts.The original body is the main piece of the car when its gone its gone. 
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Define original!  The whole body, the firewall, etc.?
Any panel that could have been replaced through GM parts
should still make a car original.  About the only part on
my Camaro that survived was the firewall.  Does that make 
my car non-original?  
I'm willing to bet that there are more re-bodied cars out
there than we know about ( now )...