All depends on your endurance condition. In 2019 completed the race with an IF of 0.75. Most of the climbs around 0.79 - 0.81 (even the Giau). Falzarego was 0.75 so fatigue was coming into town :-). Also have to take into account the altitude. Could be that you can not push the same watts at this level than you can at lower altitude.
In 2021 I hope I can do it a litte better (but not much more progression i think). Loose 2kg could help :-).