I would think BDS (blower drive service) and Don Hampton Blowers would be able to supply a kit. I know they do for the 401-425 motors. I believe that both sources use a modified Offenhauser 2x4 intake machined to accept a supercharger though. Weiand produced manifolds for them back in the 60s, I had one years ago and sold it to a guy who runs it on his street driven Henry-J. Other options would be a centrifical supercharger or turbo.
