NEED TO UPGRADE FUEL SYSTEM ON MY 90 CHEVY 454SS TBI. ALREADY HAVE THE ADJUSTABLE FUEL REGULATOR INSTALLED, FUEL LINES WITH PRESSURE GUAGE. WAS LOOKING INTO AN EXTERNAL PUMP. NEED 13-15 PSI AT INJECTORS. WHAT EFI PUMP DO YOU GUYS RECOMEND THAT WILL WORK SUPPORT 300-500HP??