The spare wheel is the N67 14" factory Sandman Alloy that would have been supplied on the car. As I said the winch cup is correct for the wheel and was the supplied Sandman wheel at that date.
The engine has a time stamp just behind/above the timing case cover on the engine block (just in from of the intake manifold) there will be a date code and a clock face with an arrow. Typically the engine date will be within a couple months before the car build date, sometimes within weeks.
The code should be 2 numbers 1 letter and 1 number. First two number the day of the month, the letter the month and the last number being the last number of the year built. (the letter "I" is skipped when working months).
Sample: 12B9 would be 12 day of (2nd month) B=February 1979
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