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forget the edelbrock, put a holly street avenger 4bbl on it. i would stay around 500 cfm. i have taken off several new edelbrock carbs and put on hollys. wow what a difference. they are way too rich out of the box, you can buy a kit to tune them, but it involves taking carb apart, changing rods and jets. holly is much easier to ajust, the last 3 street avengers came out of the box adjusted very close, only small adjustments needed. spend the extra hundred for the holly.
just my opinion, but i think you will be much happier with the performance
RICK