[The Boss]

This is all I've got for you....

['ol Pinion head]

a few notes...
Rex's aircleaner is not a '70 base 4 bbl Pontiac air cleaner, the snorkels on those are quite a bit shorter & the base itself is different. Have a few in the racks & have pulled many dozen '70-72 455 big car engines over the years. Usually tossed most of their aircleaners, very little value.

The '79 301 aircleaners have the inlet snout exactly like the one pictured above on Rex's aircleaner. The end of the snout has the small slots stamped in it. Both the F body versions & the A-B-G series 301W version use a small diameter fabric type duct (just like in Chris's pics). The rear of the domed area, directly behind the Q-jet, also has the flat area, my '80 301 F body bases don't have that.

For 1980 models, the Pontiac 301 Firebird engines used 3 different aircleaners. The 301 turbo & the 170 horse 301 used versions of a new wide mouth snorkel aircleaner. I have always bought the '80 301 turbo version with the heavily angled down snorkel. Up into the mid 90's, these were relatively hard to come up with & they are different than the '81 version. The base 150 horse 301W '80 Bird aircleaner used a small snout version, but I believe it used a AC329 filter. Such a filter would fit in a 15 3/16" diameter base. Rex, when you lay a tape measure across the beaded edge of the top of the base, does it measure 16.5" or 15 3/16"? That's prob easier than looking for a 14" & 12.5" diam aircleaner filter to drop in...

[Baron Von Zeppelin]

oPh - shouldn't it have the distributor indention at rear if its a 2nd Gen Bird breather ?

My 77 Catalina 301 2bbl has the snout like you described with 2 slots in the end.
And a fabric type hose slips right onto snorkel.
Just ike Boss's picture.

Have another (unknown) one just like Rex's (4bbl) but no slots on the end of snorkel - and it still has the adapter installed into snout that takes it to the larger round air intake hose size. (4 to 5" diameter approx)

Have a 403 TA pan - offset - not as deep of drop as 400 pans - but has the distributor indentation. No slots in end of snout - had an adapter.

Also found in stack - TA type drop base - indented for distributor -NO SNORKELS AT ALL
wtf lol
seems like someone told me what its application was a while back - or read it on here maybe - but already forgot.
Early 2nd Gen Camaro with Cowl Induction ?
70.5 TA with L85 option ?