Recommended fuel pump?

A regulator is part of a GOOD HP fuel system and with today's fuels, a return system should be, too. Either you want a good fuel system, or not. Even a "mildly built" 440 is going to have a thirst for fuel over that of a stock engine. It needs a good pump. I normally run high pressure pumps with all of my hot builds, but this slant six is an exception, because no one makes an HP pump for it. But I plan on modifying a Carter strip pump for a big block, adding a return style regulator and a return line to the tank. It's really the only way to feed a real HP build. While you don't have to have a return and you can run a low pressure pump and dead head it at the carburetor, with today's crappy gas, a good return really helps and an HP pump is really the only way to support that. Good luck with whatever you decide.