It's tough to say what the crankshaft power would be between the two, given that drivetrain losses vary greatly between RWD and 4WD drive trucks, and I'm not totally sure which Edelbrock used for their system. Edelbrock has pulley's ranging in size from 4.125" down to 2.75" which can be used to increase the boost pressure of the kit. Your best bet would be to call us directly at 1-877-578-2433 if you have further questions or to order a system in conjunction with a smaller pulley.