I believe the requirement is to run the car as it was in period thus if it is a 1976 car then it can't run 1981 parts that were homolgated subsequent to its years of competition.
It's a dilemma though because theoretically you may be able to run anything that was homologated in period. The difficulty is that you have to show that those parts were actually installed on the car, or the car that you are replicating, in question.
This is what I had to do for the Rover.
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