I can't help but think that as long as you are trying to produce huge pressures from the pump, then drastically reduce them via a regulator, you are going to have issues.
http://www.rx7club.com//showthread.php?t=529605
That's a writeup I did on the Carter pump/Holley regulator installation. But it might not be of use to you since you want a quiet pump (those Carters are LOUD). However, if you contacted somebody with the knowledge (like maybe Summit or Respeed) and tell them you need a pump similar to the Carter but quieter, they might be able to steer you in the right direction.
I have also heard that it makes a difference whether or not you run a return line. So make sure you get that straight.
But overall, I think you will be much better off using a pump that gives you what you need, without going too far overboard. Too much pump will just cause strain in the pump, use more juice to run it, then have to be tamed down by an overworked regulator. But, I don't have gobs of experience in this, so maybe I've got it all wrong.
Best of luck with your project....
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