INDIANAPOLIS — The biggest schools in college sports are about to get a chance to make their own rules. The NCAA Board of Directors voted 16-2 on Thursday to approve a historic package of changes that allows the five richest football conferences — the ACC, Big Ten, Big 12, Pac-12 and SEC — to unilaterally change some of the rules that have applied to all Division I schools for years. Representatives from those leagues representing 65 universities will also benefit from a new, weighted voting system on legislation covering the 350 schools in Division I. The five largest leagues contend they need more flexibility to solve the day's hottest controversies, including recruiting and health insurance, and complained long and loud over the past two years that they face more scrutiny than everyone else.