440 Six-pack air cleaner question

This is related to stock parts only (granted, B or E body parts), but there air-grabber and non-air grabber versions of the 440 6-pack air cleaner. What are the differences between the two? Does it change between body types?

Most importantly, does any particular 440 6-pack air cleaner sit lower than the rest? It's going in an A-body so I don't care if I need to modify it, I just wonder about hood clearance.

I could've sworn that I asked this awhile back, but couldn't find it in the searches.
Thank you!
JOS