Replacing fuel system

Hey guys it's been several months but I am ready to buy the parts to get my 6.4 back up. I made a thread back in December about it going down and the Ford dealer replaced the hpfp and afterwards replaced 2 injectors. Still wouldn't start. Is it necessary to replace the just replaced hpfp? Also can anyone recommend a place for new injectors? I just want to get the truck up and trade it in right away. It's in my driveway so all the work will have to be done by myself with the cab on. So far I've only ordered the fuel injector lines. I'm planning on new filters obviously and new fuel cooler as well.

You are going to need some diagnostic tools at minimum to get info that we can work with. Try FORScan

What is rail pressure when cranking?

What pressure is the low pressure fuel system putting out?