Go here and see combinations 11-16. These are dyno'd combos from the Air Flow Research site. Note the rpm's where max torque is achieved. As you're aware, on a street motor, you're lookin' for max torque rather than max hp and you want it down low where you can use it. I read a Car Craft article on the SysteMAX, they seemed to have a little trouble pulling the dyno numbers that Holley claims. Of course, the price is right on the Holley combo......
http://www.ryanscarpage.50megs.com/combos2.html