Yes, that is a legitimate '64 air cleaner (and a legitimate '64 air cleaner decal). It's the "small 'n' tall" variety described today in
this thread.
There are no details about this engine that suggest it's not a '64 item…but there are no details that suggest it's not a '65 item. There are minor details suggesting it's not a '63 or a '66 motor.
See post № 6 of this thread; it's not a "V-8 pedal unit". It was used with V8s, and also with Slant motors with factory air in '65-'66.
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