Fuel System Help
 

Alright guys here is a quick rundown on the truck for you.

stock bottom end 5.3, stock 862 heads with valve job and brian tooley springs, morel lifters, factory rockers with trunion kit,
truck intake, bosch 60lb injectors, running a borg 75/87 t4.

truck is not done yet, last night I installed the racetronix 340 pump in it and this is a returnless fuel system. My goal is to make 500whp on low boost, but my question is should I keep stock rails?? should I put a fuel regulator on it.. ive searched and searched but I can't seem to find a clear answer of what I should do. I am open to any suggestions thanks for the input