Pretty simple trick, remove tamper proof ball from throttle shaft. If it's original, it's almost harder than the drill bit you're using. Once out, use a flat tip screwdriver to turn the screw in the throttle shaft counter clockwise. 1/8th of a turn makes a big difference so start there. If you want to turn it up more than that, be prepared to plumb in a rail pressure gauge and do a "snap test". Pretty easy to do, there is a plug at the shutoff valve that you can plumb into. Truck warmed up and running at idle, snap the throttle wide open and observe the peak pressure on the gauge. You need to stay under 200 psi on these Small Cam engines and ideally around 180 psi at the high end of the spectrum.
