I remember seeing them advertised in a magazine around 1991? Does it have a converted Offenhauser dual quad manifold for the blower manifold? Companies would convert the Offys for blower use. I remember seeing an Oldsmobile and the 671 blower was on a converted Offy 2x4. Must have been cheaper or at least easier to buy those new and modify them for the blower. Neat stuff. Even the Hot Rod companies were Hot-rodding parts for a different use.