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We then theorized that lots of guys rebuild 258 engines and add a 4.0L H.O. cylinder head, so why not just run a carburetor? To that end, we ordered up a Holley 390cfm four-barrel carburetor and Holley's spring loaded needle and seat assemblies for off-road use. The 10-inch Holley air cleaner would clear the valve cover, but the required Clifford 4.0L intake manifold was back ordered.