Covadonga was by far the best they had then. But that was a time when their shorter gear was 42x23 and a climb like Pajares shred the peloton to the point that sprinters couldn't catch up even if the finish was 60km away from the summit at León.
Hinault was kicked in the Pyrenees in 1983, losing 1min at la Bonaigua and 2min in a MTT at Panticosa, near Formigal, so they weren't that bad. But wider gear range, better training and shorter stages have rendered many of those climbs irrelevant.
There was a climb to a small ski station at 
Rasos de Peguera (18km @7.15%) that was used twice in the '80s, but it didn't stick. It's now part of a protected area and apparently they're not willing to take a bike race there. The climb was only  used since then by the now defunct Setmana Catalana, but never by the Volta a Catalunya, although they got close this year on the penultimate stage at the Santuari de Queralt, which are the first 5km of the 18km long climb.