A few years back I put an Edlebrock on my 411 series 3, as it has the smaller 383 cu in engine I used the smaller 600 cfm carb, for the larger 400 cu in engine you would need at least the 750 cfm unit and it may be better to go for an 800 cfm carb as you suggest.
The Edlebrock performer series carburettor numbers are:-
600 cfm EB 1405
750 cfm EB 1407
800 cfm EB 1413
You will also need the Edlebrock Throttle Lever Kit for the Chrysler installation, part number is for that is EB 1481, I also bought their fuel line kit part number EB 8135 but from the look of what is still in the box I did not need it.
These Carburettors are available in electric or manual choke form , I opted for the latter and bought a 6ft universal choke cable ref SUN 50525 from my supplier in the UK, Ultimate Spares of America.
I also now buy parts from Summitracing and they also list the Edlebrocks with reference/part numbers EDL 1407 and EDL 1413 for the 750&800 cfm units respectively.
The Edlebrock bolted straight on to the 383 intake manifold and as I understand it the 400 cu in engine uses the same manifold so it fit your engine without any problems. The height of the Edlebrock was about the same as the Carter that came off, the air filter fitted straight on and there were no clearance issues. The installation worked well was easy to set up and hot and cold starting presented no problems.
Summit are very helpful if you have any questions before you buy parts.
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