I challenged all six blocks but am not holding up much hope. The clips: Howard Stern 1984 collection, Jill Goldstein collection. Pages 50th Anniversary, Arnie Barnes collection, Dave on Tomorrow show, and Albert Brooks, 1982.
Blocks aren't as bad as takedowns; takedowns give you copyright "strikes"; 3 strikes within the same 3-month period will lose your YT channel. A block is simply that. While it stinks, there are no penalties.