Look up your regulator part number and see what the adjustment range is on it. Most regulators are either low pressure or high pressure and you can't adjust them to go from one to the other. The only difference is probably the spring inside the regulator so if you knew what you were doing and had access to the parts you could turn your carb regulator into a EFI regulator. Maybe someone who rebuilds regulators can do that for you. Then it will just cost you a rebuild kit rather than a new regulator.