There was a discussion about the stickers on side of the Quadrajets. We just purchased over 1600 early Quadrajets from a collector and got them to the shop today. In this collection was over 40 engineering master Quadrajets. Built before production and used on flow benches for testing. Never been on car or had fuel in them. Some of the Buick’s had the round sticker, and Buick’s were only ones we found that had them. Most of these have tags with data from testing. Didn’t have time to review them all. Not sure if the sticker reason can be found in this data.