The lines need to be rated to handle the constant heat cycles and pressure of the hpop system and standard hydraulic line is not. I'd be hestiant that the ones found on eBay unless OEM are made with suitable rated hose to be used on these trucks for the hpop system. I would look at getting a...
The PCM reads boost from the MAP sensor so having your EBP tube and sensor unhooked will not affect the boost reading your PCM is seeing and relaying to your Torque App.
The Bosch pump that is stock to the 7.3 SD is a popular choice to use for Efuel conversions on the 94-97 OBS 7.3 trucks. It's what I'm using on my Efuel set-up. They have a good track record of being a solid reliable pump. I don't know much about the 6.7 fuel pump to comment on it.
I have the Strictly Diesel kit on my truck and I'm happy with it. The instructions for installing it with pictures was well laid out. I would prefer to have the fuel pressure regulator mount on the HPOP reservoir vs the alternator but otherwise no complaints for it being a complete kit with...