H Engine - pre 9/77 and post 9/77

Aug 30, 2021
dublin, ireland
Just got my first FJ40 with a H diesel engine in it. Its an Australian import. Sourcing gaskets etc and parts are either pre 9/77 or post 9/77 and am not sure what the difference is. Think the engine is probably 1979 from other threads, number is h67979, but cant be fully certain. Is there a difference and how can I identify which age bracket the engine is. Thanks

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