Trust me:
There are more than the 1.5 '83 Corvettes most know about(the half was the C4(an '83) above the main entrance to the plant)). The Museum had this half when GM took it down(Probably late '96); I'm guessing they still have it but am not 100%.
I've heard many stories from reliable sources that there is an '83 in Milford, and possibly more than one at the Desert Proving Grounds in AZ. You'd be surprised what GM has tucked away all over the US. They have the strange habit of 'giving' various trade schools/educational institutions prototype/very low serial number cars for 'training.'
Regardless, I'd say it is *very* unlikely that the aforementioned story holds any water..
The truth is out there!
Brian A.
90 ZR-1
12.09@118
01 Z06
not quite stock