I have a GM hood that is vintage 69. I noticed that by the cowl, you can see some very small cracks in the metal at the point of the hood being stamped to form the cowl. Hope I'm making myself clear but it's evidence of the process way back then. You wouldn't see it on the new (er) repros.
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
67 Belair with perfect floors, pinchwelds and firewall. Hmmm!