616 =
Option 612 - Air Injection Reactor (AIR) Exhaust System
Option 614 - Positive Crankcase Ventilation (PCV) System
Both required in California 1966 with manual trans, went hand-in-hand with your WW (Cali) engine code.
Air cleaner (if original) should have a pipe going from it to the valve cover.
aka closed system
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