Quote Originally Posted by Maysik View Post

Compliance plate states 1/76 HJ Panel Van.

So definitely HJ with pollution gear.
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.