You said: How odd that Senator Byrd fails to mention that in 1975 he voted (as part of a simple majority) to change the filibuster requirement from 67 votes to 60.
Thank you for that information. Senator Byrd also neglects to mention that modern "filibusters" do not include ANY real debate, rather, they are used to stifle votes and debate, clearly contrary to his stated point (but not his actual intent) that debate should be paramount in the workings of the Senate.
See the second last paragraph of the linked article for more info:
http://www.cato.org/dailys/07-16-03.html