I've done some work with these separators and don't believe they are simply a bolt on and everything is good. the HP440 and hemi fuel systems were a "package" deal. they used higher pressure pumps than the standard v8's. the higher pressure pumps were necessary to compensate for the pressure lose of the .060" orifice. a 5-6lb pump will drive fine (HP440's and hemi's used 8+lb pumps) but may be a power lose (they were for me) vs the HP pumps. if using something like a 5-6lb mech pump reduce the orifice size to .035". I've found the 8-9lb mech pumps need about .075" (or more) to control the pressure and even at that there are big pressure swings at low rpm but will stabilize around 2000rpm at 7psi. of course a lot depends on how one intends to use their car.