New engine for my Suburban, trying to tie up some details.

Fresh L31 Vortec longblock, internally stock. Fresh 5.7 injectors. Ultimate'd throttle body. Mercruiser TBI intake, Thorley tri y's w/ Y pipe.

Looking for reccomendations on fuel pump and FPR spring. Not certain on what pressure I should be looking for. 14? 16? 18?