I don't think there's an Edelbrock that's going to come close to feeding a 557.
Demons, I've heard a slew of issues around them having casting flash and crap in their feed channels. Too many stories to trust them. Many guys have had good luck I'm sure, and the billet metering blocks and throttle plates have to be a good thing.
Holley, is the "standard". I don't think you can go wrong. I have a 950HP that has been great...I'd definitely look at getting a "custom" carb from somebody like Quick Fuel or Pro Systems. You're going to pay a good chunk of change for a 950 no matter what, it probably wouldn't be much (if any) additional cash to have a carb shop hook you up.
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