This debate is getting old fast. The 4bbl will work just fine and the recommended carb is a 4bbl 390 which are getting hard to find unless you go buy a race carb. A 600 will work fine it just has to be jetted and worked a little. I like the edelbrock carbs over the base holleys.
The fuel distribution issue is real, believe it, I mean really this is not the hard part to determine. What most people don't realize is how many different 4bbl manifolds are out there. Some are much better than others, the one piece long runner types are the worst for fuel distribution - they actually really suck. I know of at least 4 different types and have 2 sitting in a box.
Tony D has done lots of research, and not in a seat of the pants fashion, I'm talking about measurable repeatable test that produce real numbers. I haven't always agreed with everything he says, but when it comes to building cars and racing them I can't hold a candle to his experience and I value that and am thankful that he is willing to share his results with us even after he gets flamed and basically called a liar.
You also have to realize that his research has been to get that last little bit of power out of a race motor - so the room for error is alot smaller than would be on a street engine that may rev to 6500 rpm. For the normal driver, the 4bbl setup will work fine, better than SU's - I dunno I think it's all relative to what better means to you.
Give it a shot