Fuel Pressure Regulator Required?

For me it's not up for debate. I don't give a five pound CRAP what the spec sheets say. My experience and the experience of everyone I know who has run or does run Carter style carburetors, including Edelbrock, has had trouble with much over 5 PSI. That's just how it is. If it was my setup, I'd run a regulator and a return line.