I have a Holley Sniper EFI tank with internal 255lph pump and used an Aeromotive 2 stage pressure regulator (P/N 13220) with a carburetor. That regulator is specifically designed to regulate an EFI pump for a carbureted engine. I set my fuel pressure at 6 psi and it holds rock solid.
Here's a link to the regulator: https://aeromotiveinc.com/product/efi-2-carb-dual-fuel-pressure-regulator/
Hope this helps