I have the Nat Fleischer RING RECORD BOOK 1966 Edition. On page 465 under Bob McKinney's record there is a fight listed with Les Borden. Since McKinney was a lightheavyweight from Tacoma, Washington, I'm assuming it's the same Les Borden aka Leslie Borden who started off as a lightheavyweight & went on to fight as a heavy. The result is as follows:
1963: May 31-Bob McKinney KO'd Leslie Borden 1 round at Tacoma, Washington.