If you watch at the bottom of everyones 1st post , there is a description of there truck / signature , fill this in at the user control panel , then you can get answers that apply to what you have .
Generally delivery valves are going to be about 6-8 steps down the road of mods , take the long term view , and tell us what your plans are , all mods should be intended to work together , what are the uses of the truck , how much HPs are you shooting for ?