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Most like either a Q-jet or Holley type carb. Lots of guys have had problems with the E-carbs.

The only E-carb I'd use is one of the Q-jets Edelbrock use to make.

Most say a 400 needs a 750 carb. But I know of one guy who did some dyno testing on carbs, for his 400. He found that a SS-680-VS Quick Fuel brand carb was best for his street 400.

http://www.gtoforum.com/f178/opinion-carberater-400-motor-86857/index2.html#post624025

http://www.amazon.com/Quick-Fuel-Technology-SS-680-VS-Carburetor/dp/B003M8YV4I

But, since you've already bought it, I hope it works well for you. :yes
 

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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.
 

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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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