I am NO exhaust manifold expert but I can help with the "basic" 32-36 manifolds, the first two pictures is a set of 1932 manifolds, note, they are flat and straight over the whole length of the manifold....THE basic change till 37 was the left side manifold to accommodate the oil dip stick so the third picture shows the hump of the left had side manifold. the right stayed basically the same all the way through.