The McDonalds All America page http://www.mcdonaldsallamerican.com/ has the basic averages for each player:
Smith 22.1 PPG, 4.6 RPG, 4.1 APG, 3.2 SPG
King 27.6 PPG, 11.7 RPG, 2.0 BPG
Singler 29.7 PPG, 8.8 RPG, 3.0 APG, 2.0 SPG
Since Smith is the only Oak Hill McD's I can't compare him to his teammates stat wise. If you want to try to assemble the data, all the Oak Hill box scores can be found at http://www.oak-hill.net/athletics/gold/gold_updates.htm