Here's everything you need to know to dial in an Edelbrock Performer or Carter AFB carburetor...
http://www.edelbrock.com/automotive_...ers_manual.pdf
A high-rise, dual-plane intake such as the Edelbrock Performer RPM will add 30-40 hp to the motor, along with the same increases in torque. The standard low-rise Performer is little more than a lightweight stock manifold, meant to provide good driveability from idle to 4000 (back and forth to Bingo) and remove weight from the front of the vehicle.