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from all i have read and heard u need to go to edle brocks special 440 edition carb i hear they are the best around i plan to put their version for my 300ex on
My buddy and his brother both have 400exs, one a 44 w/edelbrock the other 426 w/fcr 39 and the 426 smokes the 440 all the way around.(Hill climb and Drag)
I doubt this is all because of a carb but its my $.02