Pronk, it's all relative to his present ability, to a larger degree, and projection, to a lesser degree (pros put more emphasis on projection). D1's expect present ability but might take a chance on a kid they expect to experience a "jump" soon. Bottom line is, D1 velocity at a minimum is 84 but 86-87 more likely (LHP). Add 1-2 MPH for a RHP. This assumes some offspeed pitches as well. If your kid is not yet there consider some other options that would enable your son to develop.