Fuel line - I think in the region of 40-50psi (300-350kPa). You MUST use EFI fuel hose from the high pressure pump to the fuel pressure regulator (basically all the high pressure parts. You can use carby fuel hose for the return part.
Camira, VL and VL turbo pumps are supposed to be identical, are common and will supply plenty for a 4AGE. They are external, however I am not sure about any in tank options. I doubt anything will be a straight fit in a KE30.
A brake upgrade is a very good idea. Quality pads (if available) and fluid may tide you over in the meantime, though you should upgrade them.
A loom may turn up second hand, but I'd recommend going to a self serve wrecker and grabbing all the plugs you need, then getting a wiring diagram and manufacturing your own loom.
Hen
Bookmarks