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Finally got back home to work on the 427s. The carb flanges of my intakes are definitely angled. It is hard to tell on the photo you posted since it is a top view. The rear intake runners look much more pronounced than the front runners like mine. Intake casting number is C7JE 8425A and the starboard engine has the firing order ground off. They are Ford castings from the "FoMoCo" logo on them. I will take some measurements and photos and post. In any event, I am not sure if all CC 427s were built that way or not. I think mine were manufactured in 1968 and put in a 1969 model year Commander. It may be significant, maybe not. High RPM lean out can be a problem.