Hi and welcome to the forum. The main pump adjustments are covered in the link below in good detail. It is from a dodge cummins diesel site but the pump is the same and the writeup is good. Read the link below on runaway first.
http://www.dieseltruckresource.com/d....html?t=158962
http://dodgeram.org/tech/dsl/more_power/Power_ve.htm
Take a look at some of the threads on turbo combinations. If you really want to up the power I would get rid of the stock turbo, the compressor side isn't all that efficient and the exhaust side has a restrictive design as well. Adding an intercooler should also be near the top of your to do list. Depending on how far you want to go, next would be head studs so you can really turn up the boost. With a better turbo, intercooler, and correct pump timing you can push an easy 15lbs of boost with the intercooler and the car will be pretty fast.
Check your injection timing as well (not detailed in the cummins write ups) and time it towards the top of the spectrum or maybe a little higher. I would shoot for .90 to 1.0mm.
With a larger turbo I would step up the downpipe as well, to 2.5". The factory air filter is good size, but you can open the box up a bit by removing the intake baffle that goes into the fender, and "swiss cheesing" the front of the box behind the headlight for more air flow potential.
Jason