Valley Forge is another D3 to look at http://uvfpatriots.com/schedule.aspx?path=baseball
One of Valley Forge's pitchers topped out at 70 mph on his Perfect Game profile. Don't let anyone here discourage you that a kid can't play D3 somewhere if they top out in the high 70's. That isn't even remotely close to true.
In fact, a kid like the OP describes might be too good for Valley Forge or Yeshiva or Vaughn College etc
Valley Forge plays in the CSAC Conference. I would look up and down at that conference, look at every roster, and see if you can find Perfect Game or PBR profiles for the pitchers in that conference. Start comparing velocities.....