6.0 Falls Dead, Cranks Up?????????

[JJAB]

Here is something i just thought about. I am running a Sorenson fuel pressure regulator, autozone part #800-329. In the part description it says it is for a returnless fuel set up and it is supposed to regulate pressure to 50psi. But it says the regulator is ajustable. How is it adjusted.

Ok, I have the truck intake on this 6.0, what fuel pressure regulator do I need to get that will install in the truck intake but regulate the pressure at 58to 60.