I know that most of college football has gone to primarily "spread" type offenses. Are there any wishbone or run based teams in D3 ??

Hello, my son is wanting to transfer to a D3 school within the next year to play football, he's thinking he might want to stay close to home & play at Hendrix. He played running back & MLB at a small high-school & received a partial scholarship to play D2 ball. The college he went to told him that he didn't have the speed to play running back for them but they wanted him at linebacker. He played for a year then stopped to focus on school. He will be a junior next fall and his dream is to play running back again at the D3 level. He is 5'10 at 210 pounds. His 40 yard dash is around a 4.7 and his last bench max was 370. Does he have the speed & tools to play running back at this level?? I would also like to know what the average d3 running back's speed & strength is like. Thanks for all the help!!