Putting a blower on that truck turning 38"s without gears will put ALOT of stress and load on the motor and tranny. I would highly suggest doing gears(4.88s) before a blower.
Extra load with the blower wouldn't allow for much timing in the tune due to the load and it would be more prone to detonation.
Trust me do it right first!
Once you get gears you will gain a lot of power back. And if your still want a blower do it then. Lifted on 38"s with a blower is fun as it can be. Sure do miss my old truck!
Dyno Pull Video