Hey Darrell,
Thank you for posting all the detail pictures of your Z/28. Could I request some more?
I am pretty sure your PCV, hose, and clamps are original. I would like to see the PCV valve to see what if any markings are on it. Also the choke vacuum pull off front and back, and the heads of the coil mounting and distributor clamp bolts.
I am kind of partial to the paint code too.
Mike