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First off, this contradiction is real nice. Technology didn't stop in the late 60s.Think about how quickly technology was progressing back then... the cars from the early 60's would be trounced by the cars from the late sixties.
In fact the 330 GT40 XJ13 would probably give a good battle to cars from the mid to late 70s if not 80s.
Secondly, the cars you mention battling cars from the late 70s/early 80s? Absolutely not possible.
Read up on the 1981 Porsche 917K/81 and you'll see why it's not possible. https://www.ultimatecarpage.com/car/6766/Porsche-917-K-81.html