I just drill out the oriface just 1/64 larger on the pressure side of the pump on a Saginaw unit. This is because when you autocross and saw the wheel fast back and fourth the power assist can sometimes stall out. Don't really need that in daily driver type car.
The power steering pressure flow deal was written up by Rick Ehernberg in Mopar Action.
But as Dan suggested, try to have the car aligned with up to 4 degrees positive caster. If you can't get more than 1 deg pos, install offset upper control arm bushing per the instructions below. DO NOT use the instruction in the box to get more caster.
