My 66 does not have a shroud, nor does it have air conditioning. I was ordering a shroud for it but then cancelled the order due to high shipping charges. But when I ordered the shroud, I also ordered the correct metal clips for the shroud. So there are clips.
I kept the clips because I will eventually put a shroud on my car. Right now I have an extra pusher fan that makes up for what the shroud does.
Research shows that two clips are needed but that was based on one website's facts.