Take a look at Fuelab's pumps. I'm running one of their low pressure 2 speed pumps on my 493" six pack motor. When the secondaries open a micro switch steps up the pump to high speed, otherwise it runs quietly on the lower speed. They have some nice products and good tech support.
Also, it's one of the few electric pump manufacturers that allow the pump to be mounted above the fuel level. Mine is located right near the top of the tank and sucks fuel through 2 Holley Hydromats via a pair of 10AN lines.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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