Most Block in a game: Elmore Smith, 17, 10/28/1973
Most Rebound in a game: Wilt Chamberlain, 55 11/24/1960
Most Assist in a game: Scott Skile, 30, 12/30/1990
by the way, since you are asking for "the most"
in 1961
Wilt Chamberlain had a monster season
recorded: 25 rebound, 50.5 point per game.