I guess it depends on context. I might call them "1961-'69 stock slant-6 air cleaners", I might call them "1961-'69 except '62 170 stock slant-6 air cleaners", I might call them "annular-intake silenced air cleaners", I might call them "air cleaners without snorkels".
Yes, but it's thousands of miles away in storage. Here's a not-very-clear one. There was a shield spot-welded to the base plate extending vertically and outward to guard about a 150° section of the air cleaner from road splash propelled rearward by the radiator fan. The rest of the element had no guard or cover.
None that I know of. The 1962 170 item was referred to as an unsilenced air cleaner, and yes, they are considerably noisier.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks. If my monitor wasn't so dark That pic would be good.

I read there was some problem caused like a "flat spot." I thought they were referring to the mushrooms. Annular sounds like a Holley thing.

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'72 Duster 198 stock cam, 3:23's

93 D350 Cummins THD Maxfuel 35mpg parts to hit 400hp+ Suncoast Cat2 A518, converter DDP Stage III injectors 62/64 HX35, 3 piece manifold, 4" Diamond Eye, Gear Venders OD. Stage I street/tow PDD head on order.

Ahhh! I know what you're thinking of. It's the other way round: if an air cleaner with a snorkel is installed wrong, it can cause a flat spot. See here.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.