Necro thread raised from the dead for the potential interest of original posters...
It looks like L5800008 potentially mfg. on 032189 could be for sale on BaT. The donor engine swapped into the car seems to be L580008 (or L580003?).
Sale also includes the engine original to the car (but not transmission).
Full VIN may be: 1G1YZ23J3L5800008
VIN corresponds to a Pilot car with YE8 option.
https://bringatrailer.com/listing/19...vette-zr-1-83/
Not my sale, but when I'm looking for things, I often find them with help of others in a similar way.