Outside of what others might say about Edelbrock (and of course with good reason about how Vic Jr has been public about his disregard of the Y block), the last B intake I put together on a 292 (bored to 301) Y block, I tried a 500cfm Edelbrock with the manual choke. Out of the box almost 0 tuning was needed and it has performed well for the street. I personally like a manual choke and rarely is it needed for most that live in a milder climate/drive our cars only in decent weather.
I recently got a hold of a 390cfm Holley 4 barrel from "Cactus" here on this forum in a little parts swap we did together and I will be installing that on a 272 pretty soon. I've only heard good things as well.
The difference would probably be that Edelbrock carbs tend to be a little bit cheaper when purchased new, and the Holley carbs are a bit more. However, I believe that the Holley's are more common and there is more ability to "tune"... somebody else can chime in now, lol. Some of us on the forum stick to our carbs like we stick to oil recommendations. It can start a heated debate!
Daniel JessupLancaster, California
aka "The Hot Rod Reverend" 
check out the 1955 Ford Fairlane build at www.hotrodreverend.com