I'm pretty sure that is a Firebird air cleaner. If you look at how deep the surface is the air cleaner sits on relative to where the carb sits, you will see there is a big drop down. That is typical of 1970 and up Firebirds.
The type of snorkel is made to duct over to the core support, so it would be a 73 and up.
I'm guessing it is a Formula Firebird base or possibly a Trans am air cleaner base.
I didn't see a drain hole, but I saw the carb vent that Pontiac Q-Jets used starting in 1971.
Mike
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