That is the same as my '88 K3500 that I purchased new in August of that year. 5.7, 400 trans, 8600 GVW, 2 speed wipers, vinyl bench seat, manual windows, manual heater controls, rubber floor mat, AM radio
Mine came with out a G-80,tow hooks, front air dam, rear bumper, spare tire, under hood light or insulation.
I still have the center dash insert in blue in the garage some where. and yes there was a storage cubby in it.
I had it for 30 years before it finally got to rusty to fix. They were not all that uncommon back then, we sold lots of them at the dealership i worked at. Most of them where bough by Township/local governments for fleet trucks. Contractors also ordered them as they were cheaper to buy and maintain than a fully optioned truck