Does this p/s pump modification work?

I read an article (Pump it down rev1) by Mopar action that shows that if you modify the valve in a Saginaw pump (to lower pressure) your overall steering will be closer to a modern type feel (similar to firm feel). Has anyone done this mod? I will post a link to the article asap. They noted that 6 cylinder pumps had lost pressure from the factory, around 850 vs. 1350 for a v8 pump.