i have done a lot research on the str14, i have one also, they came in two styles, one str14/4 and str14/6 and then there was the str14/8,the str14/4 and /6 tops wont fit the st14/8,the bottom manifold is cast dfifferently, so , you cant put a crossram (2x4) top on a single 4or 6 pack manifold, also the dc mod books really only touch on the subject , not a lot of info there either