Yep. Your limiting factors are going to be the orifices in the PS gearbox and PS pump fittings.
Pressure is easily changed on these setups anyway, and GM has run probably hundreds of combinations to achieve different pressure and flow, so with a bit of research and a couple of parts pumps, you could experiment yourself.
What are your goals? For my use the PS assist is too much, and lowering pump pressure did not solve the problem. I believe utilizing a different torque rod in the steering box coupled with higher (or same) pressure is probably a better approach.
Obviously each application is different, but most seem to agree that driving these on the road is like driving a boat, steering response is non-existent. Off-road, assist is normally plenty. Making sure all steering components are solid, and eliminating the rag joint will take out all the inherent slop you can, after that it comes down to the steering box, pressure, and flow.
