I need help to authenticate a LS6 Convertible

[ANDY M]

"Sounds good. However, most of the guys who have them can
afford them, but they still don't race or drive them."

This is how you end up with barn finds. If a car becomes a White Elephant, the owner says "It's not for sale" and sticks it in a barn or garage, or even worse his backyard for someone else to find years later. Sometimes the car is a gem, sometimes its a crusher.
A Yenko or a COPO or Hemi could be had for next to nothing in the mid-'70s, and many have been discussed here. However, when you suddenly figure out that your car is worth more than your home, and you don't have the resources to restore it because you've retired, but you can't let it go...