As far as the powerband of the 22RE, I believe it would make decent torque through-out the RPM range. Also the I've heard the long stroke (3.62 inches) safely limits RPMs to around 6000.
6000
ive had mine over 7500, very short time though
torque starts building in these little guys really low, depending on the cam profile and cam timing anywhere from 1500-2500
