looking for 600whp on pump i know its possible but what fuel upgrades are neccassary i have so far intank 255 and bosch 1000cc do i need inline as well?? also are stock fuel lines fine

 

Mannn search! But just because I'm bored...I'll help. You definitely either need to run a bigger pump, or add another one. You could do a dual walbro in-tank setup, or run a inline pump (bosch 044) with a larger feed line, then use your stock feed line as a return.

That is what you will hear all day here.

 

^ditto.

 

you can probably get away with the single walbro with the pressure bypass modification and turn up the base fuel pressure.