Top injector is the air shrouded type, uses 2 seals., As Loon said the lower one is a brass version of the earlier non shrouded injector.
Air shroud is supposed to help cool the injector and allieviate the fuel vaporising, prob aids in air moving around the nozzle as well ??
the pressure limiting valves were the 1.5 cut of pressure version not the 3.5's ..?
looking good Pete, glad you have the time to put into it mate.:cool: