INDIANAPOLIS — The NCAA Board of Directors overwhelmingly approved a package of historic reforms Thursday that will give the nation's five biggest conferences the ability to unilaterally change some of the basic rules governing college sports. If the 16-2 decision stands, there will be striking differences between the 65 largest schools and the more than 280 others in Division I beginning as early as Oct. 1, though few expect change to come that quickly. "I am immensely proud of the work done by the membership," NCAA President Mark Emmert said.