Stock style steel line works fine for EFI. I use Inline Tube re-pop 3/8" for supply and 5/16" for return with Aeromotive regulator in the engine compartment. I am running 50 psi fuel pressure with FAST XFI. Road track and X country.

For flex connections at the tank and engine (and filter possibly) you could use EFI spec rubber. I chose to use braided AN hose. I double flared the steel tube and used needed adapters to AN.

The factory steel line packages well around the rear spring hangers and is tough.

For pumping duties, I tried a frame rail mounted high pressure pump. Not good. It cavitated and failed (twice). I switched to in tank pump which has been trouble free. A surge tank can work well also I believe... with suitable low pressure pump to feed the surge tank and high pressure pump from the surge tank to engine.