Hi arcturus
Its the standard pre 66' aluminium manifold that was used with the single down pipe exhaust manifold he is talking about. What guys do is sever the intake side from the exhaust side on the twin down pipe/twin carb Siamese cast iron manifold and use the aluminium manifold with that. Only problem is that you have to skim the exhaust flange or make up some shims for the intake to fit because the two flanges are different thicknesses.
Dylan
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