If your tag has ADR 27A on it, it has (or had) pollution gear. It was mandatory as of 1st July 1976 but Holden would introduce early in preparation.
Anyway, ADR 27A on the tag tells the story for the charcoal canister.
Selling HJ 253 Engine
Engine Number QR718*** | 19M5 Clock Casting at 6 O'Clock
19th December 1975 Suit HJ Late Dec 1975 to April 1976
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