Be careful with those! I had setup like that on a single plane intake and the divider was 3/16ths steel also pinned to the plenum floor. After few months of use the divider ear ripped off,sheared the pin and pieces went down a cylinder cracking the cylinder wall on a hard run!
I ran one for a while on a street/strip 351C 4V open chamber 9.5:1 engine. Ran a 750 vacuum carb on top. I didn't find any difference in performance or driving characteristics with or without the divider in the 4V Xcelerator. Eventually left it out.
As above - if it comes cheap-cheap the a little TIG work would put the divider back in place.
