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A few thoughts on engine build up. Ford always seemed to be behind the power curve (pun intentional) when it came to factory heads in the breathing department. Aftermarket replacement heads changed that.
If I wanted to build up a Ford motor in the 400 inch range for a Cobra, I'd use a Windsor bottom half stroker, 393, 408, and a Cleveland top half.
Bucks down with C4v heads in iron. Bucks up with Blue Thunder aluminum Cleveland heads. The Cleveland engine headers for that particular kit should bolt right up.
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