Fuel Pressure Regulator Required?

And it also says on page 9 of the Edel book that there should be a minimum of 4-5 psi at WOT.
I do not know how many times it needs to said but the quoted fuel pressure is for the datum jetting point. If you choose to run 8psi, the float adjustment needs to be changed from 7/16" to about 9/16" to maintain the same fuel level in the fuel bowl for the datum jetting.
Some Holley carbs & clones have externally adjustable float settings, set via a window or removable plug. Exactly the same concept & if this is not understood, then you are not understanding carb basics 101.