Thanks to Kevin (klhansen) for putting this together. ~ Editor

It all started with a
post in the Paint & Body forum. After some searching, Phil (Phak1) found a link that was the starting point!
Following Phil's link, I found the old page.
It's now here. Took a bunch of clicks to find it.

The attached photo/screenshots show how to get there from the GM Media Archive Home page that Phil linked.
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The GM Heritage Center can provide model-specific Vintage Vehicle Information Packages.
For a fee of $50, the Center will decode the vehicle identification number (VIN), the body plat/trim tag codes and provide photocopies of product literature (when available). The Package will be sent USPS.
Included:
Divisional Engineering Specifications
AMA/MVMA Specifications
Product Selling Information/Salesperson's Guides
Options and Accessories Information
Paint and Trim Guides
Sales Literature
Owner's Literature
Product Volumes
The Package can be downloaded for free for most Chevrolet models.---------------------------------------
In this link, the Package is called a Kit. (That is what we have been calling them!)
Let the Stovebolt Collective know if you use the Center? Many of us have used it in the past. (It was free back then. :D)
Update: Unfortunately the link on the Heritage Center broke (again), so disregard the attached screen shots. I've contacted Heritage Center Support and they could not tell me when the Vehicle Info Kits would be available again.
In the meantime, I was able to download all the relevant Chevy Truck Info Kits through 1987, so if anyone needs one, PM me to let me know which one you need. If your e-mail isn't in your profile, include that in the PM so I can send the kit to you. Be advised this isn't the whole Package as listed above, but it what was linked previously on their website.