Here is a Google sheet ranking the LSUs (longest standing untied WRs) of GE 1964, which tracks both all-time and currently standing LSUs, and all-time untied duration per level: https://docs.google.com/spreadsheets/d/1mTw9HXijCkwOTXRq3oVl0qTD48He9GS9mNiFO9Dlzp8/edit?usp=sharing

I tried making this as automated as possible, but it still needs to be updated manually for new runs added to speedrun.com