There was no specific date codes or numbers used for each model in a series, except Statesman which got a 11 prefix before the engine number for HQ-HZ (ie 11QL, 11QR etc). Engine numbers are all in the same sequence for HQ-late HZ except for Chevs in HQ which are 4 x different sequences for the 4 x different assembly plants. The sequence reset late 1978 when 999999 was reached. Date codes are as per the thread Greg pointed to and sit somewhere in time bewteen a week and 6 months prior to the ADR date of the car, normally 3-6 weeks but many months is possible.
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