The only thing I don't like about Indy single plane manifolds, is how they run the port divider into the plenum. I have 2x of their manifolds, the first one I sent to get ported & flowed came back without the dividers, they were cut right back & it made a huge difference on how the engine performed, so I sent the other one in a few years later & it came back with the dividers gone too. I have a Super Victor manifold as well & it didn't have the dividers in the plenum & it flows within 8 cfm of the Indys that have had work. The Victor is slightly taller than the Indys.