Carter elec pumps, most reliable stand alone elec pump made. Am aware of a number of Mallory 140 pumps that have failed.
The Carter pump is unique in that the fuel circulates through the elec motor section. This does several positive things: lubes the brgs, cools the motor, eliminates the seal between electrical & mechanical section [ reason that most pumps fail ]. So one less seal, one less item to fail...
Design is unchanged since it's intro in 1969 because it was so good nothing needed changing...
The 4600 series is what you want, 100 gph, though at a 6k limit you could also use the 4594 which is 72 gph. That is free flow [ as they are all rated ]. 100 gph is enough to feed over 1000hp.
