those Holley electrics are LOUD!
i'd recommend a RobbMc mechanical pump, but the website has stated Out Of Stock / Do Not Order for a while now
word is you can swap the valving section off another application and build yourself a decent 351C 6 valve pump, then put the other pump back together and sell it off or use it on your other car
start with a Holley 12-854 which neither Summit or Jegs inventory, and select from the Holley 200gph, 170gph, 130gph(3/8" NPT) & 110gph(some 3/8" some 1/4" NPT) mechanical pumps for the size & type of inlet/outlets that suit your needs
BTW, i'd also recommend a regulator with even a discount store stock replacement pump
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