The blower drive and blower manifold are home built. I was told the manifold was made from a three two barrel manifold. The short version of the story is that the carburetor mounting holes were drilled deeper, the top shaved off to expose the runners, and a plate which matched the blower was bolted on the top. The three-two was chosen because it had the most bolt holes to mount the plate. I probably left off some important detail of this conversion, but that is the essence of it.