That carb will work fine. As said, many have issues with Ebrock carbs, but from my experience tuning usually the issue. If you get timing set right on the car and tune the carb properly it will work good for many years to come.
Most 400 came with a 750 or 850 Qjet sitting on top of them, a 650 maybe a little lean for her, if so try rejetting her and changing out the rods. I ran Eddy's on Pontiac's and the only thing I found was when I punched it, it would hesitate a little, Had to rejet them and change out the rods and it would improve some. Nice thing about edelbrocks, they are reliable and easy to work on. Today I favor Qjets over eddy's.
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