I think they were originally designed to work with the B&M blower designed .
That is what they were made for. A B&M blower.
Years ago in the 12 port newsletter, a guys named Jules Glauveson(SP) was selling them as a complete bolt on kit. It had a specific bolt pattern for the B&M blower & had the correct length blower snout made from B&M.
I have the old 12 port newletter w/an article on the kit somewhere, 1980's era.
MBHD
