retard ex. cam idea.........will it make power?

Im thinking on using only one of my skunk2 adj. cam gears on the exhaust cam. I am planning on retarding it a few degrees while advancing the ignition timing to 18* btdc on 93 octane. the motor is a 90 b18a with cai ane cat-back. i think doing this would allow the motor to get a a more complete burn by giving it more time in the cylinder. has anyone ever tryed or done this;and will i gain hp through out the entire powerband or just a section of the power band?

thanks

My best gains were through just advancing the intake cam. Everytime I messed with the exhaust cam the results weren’t that good.