I noted you have tilt steering and did not mention cruise control, these two were normally checked off together at time of order submission, regardless of engine.
A common low-cost option was the sliding rear window; from the image you provided, I am unable to tell what is equipped there - the factory sliding rear window was slightly different than those which were Dealer- or Aftermarket-installed, the factory ones would leak fairly easy, while the aftermarket ones would break off the locking tab after a few months.
Is the truck equipped with a headliner? Having A/C and no headliner would place it in a unique position all by itself, as I recall A/C also meant the headliner was going in unless specifically delineated. Carpet or rubber floor mats were choices that made no difference in rarity.
Back when I was at the Dealer (80s & 90s,) all information was retained on microfiche you had to sort through (thus the insanity from "gone ficheing",) and this only had data to verify the factory options as delivered.
Production questions as this could be answered by submitting your VIN by mail to GM Photographic, and they could end you all the information you could ever dream of (almost to the names of the people who assembled the vehicle, though not quite.) Such requests normally took about three months for a reply. However since the explosion of enthusiasts looking to declare rarity and correspondingly, extra value to their vehicle, and the intense work trying to digitize all this data, I doubt such is available today.
My go to people at GM were Santi in Tech, Rhonda in Parts Support and Steph.
Santi, if you are still alive, you are the Pagan God of Everything Electrical!
