Original engine or not?

I had a 68 cast 383 that didn’t get assembled until 1971, I always wondered what happened to that block, must’ve been waaaaay back in the corner.
LOL. Or maybe waaaaaaaaaay back in the corner under a pile of seat covers made from 'Rich Corinthian Leather'.
I just bet the warehouse didn't rotate their inventory. FILO (first in, last out) They just keep filling the empty space in the front of the bin with new castings.