A fixture brimming with history will be staged at Wembley Stadium on Sunday afternoon, Chelsea facing Leeds United in the semifinal of the FA Cup. These two foes contested the 1970 FA Cup final and subsequent replay, matches widely considered to be the dirtiest and most ferocious played in English history. The north vs. south divide birthed an utterly fierce rivalry, which was eventually edged by Chelsea after extra time during the replay. Less brutality is expected during the upcoming meeting this weekend, but emotions will still run high as both teams seek a place in the showpiece event. Chelsea enter the fixture in abysmal form and under interim head coach Calum McFarlane after the recent dismissal of Liam Rosenior . After seven defeats from eight and five straight league losses without scoring, BlueCo’s patience with their inexperienced manager ran out. Such has been Chelsea’s decline, many have marked Leeds as favorites for the semifinal.…