Holley pumps don't do enough pressure. Your pump needs to put out pressure for the carb + plus as much pressure as you plan to boost to keep up with your 1:1 rising rate fuel pressure regulator. So if your carb needs 6psi to run n/a and you plan on running 10psi of boost, your fuel pump needs to do 16psi and flow enough GPH of fuel at that pressure to supply what you need for your hp level.