I picked up this carburator the other day. It is a 7028210 EE carb dated 3627 (362nd day of 1967) for 1968 396/325 hp automatic.
The carb was a GM donated carb for Education purposes, so it saw no use. It has been slightly modified for teaching purposes and also I assume to disable it from just being taken and bolted onto a car for use. Also has a sticker on it that says "DONATED BY GENERAL MOTORS CORPORATION FOR EDUCATIONAL PURPOSES".
See these images and I will try to post more later. They are good references for what an assembly line part looked like.