Walbro 450 with stock fuel system

[Matt327]

I've got a cam+springs LQ4 swapped 96 C1500 that I'm incrementally working towards making a turbo motor. I'm going to do a lowering kit this spring and while the box is off I'm going to take the opportunity to upgrade the fuel pump for future 80lb injectors to support the farther in the future turbo.

I'm using a walbro 450. With the bigger pump's flow and pressure will I have issues with the stock rails and stock regulator? Or will I have to go to an aftermarket rail and regulator setup? I have the return style rails just hooked to the OEM lines with an AN adapter.

 

[RDF1]

Im running dual Walbro 255s and no issues at idle.
how much power you looking at making?

 

[RDF1]

Used a DeatschWerks 9-401-1046 in a 2005 Silverado with returnless fuel system and it made mid 600s to the tire with no problem. Waiting on some more free time to put a 3 bar map in it and retune for more boost.