I met a fellow at cruise in last night who had a 73 z in the 80s/90's car is gone but said he had some original parts from it and his attempted restoration.Today I picked up what he had and he had a set  of said pistons in GM boxes still sealed,I opened 1 and it is the true flat top with the trough valve relief we are used to seeing on the low compression z engines,wrapped with the specially treated wax paper from 1990. I posted here as I figured IF they have any value it would only be to an "original" person to a hardcore degree and I don't even know I'd not want to put in the newest technology parts in my rebuild, plus how many 40 year old engines are standard-any thoughts? I'm thinking it neat man-cave items but I may be wrong! There are still stashes of parts out there! Later Steve!!