When Chevy "scrapped" cars and parts, they didn't always send them to be crushed in a scrap yard. They would send them to what I would call CURO. The Chevy underground racing operation.
Smokey recieved a bunch of "scrapped" cars and parts. There was a web site where a guy said he bought a parts car from Smokey which he said was 0001 serial number 1970 Camaro. I think he said Smokey had used it as a test car for spoilers or something that Chevy paid Smokey to work on.
There was a Bill M. 1970 ZL1 Camaro prototype/show car. Bill M. bought it from Chevy and drove it then later re built it into a car that looked like a prototype 1977 Camaro. There were some magazines artiles on this car.
The hood you mention is a hood I bought from Bill Jenkins. It is a 1970 prototype cowl induction all steel hood built by Chevy engineering in 1969. Chevy was going to scrap it but instead gave it to Grumpy for a 1970 show car that Grumpy used as a promotional tool for his 1970 Pro Stock program.