According to my pre-1960's archive, it looks like a "McGurk" racing manifold. Frank McGurk was well know in the 1940's/1950's. The reason I say this is from about 30 or so different pictures of intake manifolds that I have, McGurk was the only one that turned the mounting flang bolts to run the same direction as the log. (90 degree from other manifolds brands). The second clue was McGurk often used three nice size fins on top and the log. And his runners had a slight downhill flow to the head.
I would bet money that your pictures are of a Frank "McGurk" racing intake manifold.
