Wilbur that's an automatic choke manifold, see where the heat tube was broken off in the center of the manifold? You, or someone else, has fabbed a heat stove on the front half of the manifold as a replacement. Bet it works well too.
Plug with cap is indeed a flush T.
Roger I remember reading something similar with respect to the port divider not necessarily making much of an improvement, if any, regarding 3/4 exhaust flow balance. Like you, it has been several years since I was "into" the I-6 performance stuff. If installing an individual tube header it's all but impossible to seal the huge 3/4 opening without the port divider, at least with all the I-6 headers on the market when I built my 200. Stock cast manifold, not worth the effort.
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