When I took over the Tennessee Technology Center auto shop at Pulaski, TN in 1985, there was a new, unfired 65 model 409 sitting in the corner of the shop, donated by GM when the school opened. We tore it down once, and there were still felt-tip marker numbers on the pistons from the factory balancing job! When I left 5 years later, it still had never been started. I think it went to scrap when the shop closed a couple of years after that. What a shame!
Jerry