fuel pump and pressure regulator

[droptail]

Having some drivability issues, then got a CEL which showed a code #44 O2 lean.

Fuel Pressure showed 10psi. Pinching return line didn't yield any increase in pressure.

Diagnosing a dying pump I decided to upgrade to an EP381 to cover any future mods.

I may have around 250rwhp now (see sig), would like around 350hp when I have more time to play.

Can you outline, or provide the thread covering adjusting/modifying the OE pressure reg (for the EP381)?

I will be installing my Holley TBI later - I understand that has an adjustable press reg which should be straightforward to adjust?

I prob only need about 14 - 15psi with my current light mods.

Thanks