Here is a peek under the hood of my 326/2. Air Cleaner info repro sticker is in the same location of the original silk screen. Not sure if mine came with the "Keep your Gm car all GM". I put it where I thought it looked best, as I have seen it in several location on various 326 I've seen out there.
Coolant info sticker is also in the same location on Rad support as the original, but I have also seen it on fillers on AC cars.