4bbl

cheyne68dart said

Do they make a adapter from the one barrel to the two barrel with out having to replace manifold?

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I recall seeing 1 bbl to 2 bbl adapters on ebay. They are rare and fairly expensive (~$50). Also, there are quite a few different 2 bbl patterns, so would take a lot of research. A 2 bbl slant intake would seem easier and less risk, if you also get the throttle linkage brackets and kickdown.