How can I reduce the power steering pressure from my 2003 5.7 hemi from 1500-1700 psi down to 750-800 psi. I saw that heidts has a controllable reducer. Is that my only option?

I used a gm ps pump when I did a swap and kept ps. I think it was like pontiac 6000 and other similar models. I can't say for sure now, but the bolt holes lined up or were very close and the right pressure. For ps line, I used an adapter to fit.

I know the gm pumps work for the muscle cars but mine is going in a 57 wagon and they are rated lower than a muscle car. My service manual says 800 psi max. When I put my fi 360 I was able to buy a reducer that went in the back of the pump but the hemi pump is different and not sure the valve would work