Don't use the Holley blue pump, I have one in my car and I am eventually going to remove it.(hopefully sooner than later). The Holley blue pumps are designed to run at 7-14 psi and don't like running lower and will shorten the life of the pump. My regulator will maintain 4.5-5 psi when running but the huge pressure produced at idle can create issues of over fuelling and when the engine is off I have installed a relay that only operates when the engine is running as the pump pushed fuel past the needle valves to the float bowls. These pumps are designed for worked v8's and are way to big for my application and I have twin 45dcoe on a 2.4l. The pump is also extremely noisey, admittedly I don't have the correct rubber isolators at the moment but they have a reputation for it, they also have a reputation for failing when restricting flow.

if I still have it I will put a link up for a short video of my car at heathcote drags. There is a droning noise that is clearly heard through out the video until I launch, that's the pump!