Remember, CP only uses Math and English ACT scores.
There were 4 EE MCAs posted last year on the Final Status thread. They ranged from mid 4600 to mid 4700. No one knows what the floor is because its such a small sample size. He should be fine though with that SAT and GPA assuming he took at least Calc AB. Read the application carefully. Put the appropriate middle school classes in.
wish him luck.