I am in the process of putting together a wet plate system for my C5. I'm presently running a stage 2 Heads/222/224 CompXE cam in the 346CI. with Diamond forged pistons, ARP bolts, Bal/blueprinted, full exhaust with stock cats, under drive pulleys, LS6 intake, Hallteck CAI, A4 tranny/3:42 gears & a 3500 SY converter. Safety is a concern and I obtained an HSW all out accessory kit (Blow down tube, purge, filter, heater, Microedge controller). I have a timing tuner coming from an LS1 tech member and a beer sw panel. I'm going to add a FPSS also. I have the stock fuel pump( Walbro 255 I think is in the C5's) and no wide band kit, question is can I get away without changing these last 2 items? I'm at 370RWHP now and plan on going with a 75-100 shot.

 

You should be fine. Many like to upgrade the stock pump but there isn't any need for a 100 shot or less.
Many people also don't run the fpss because they are typicaly more of a pain in the *** then they are worth. I personaly don't run one but plenty of people do, it is your choice.

 

you should be fine . we have done this many times with stock pump