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if you put the intake on and place .020 feeler gauges at 4 corners [you should check low and hi ] and the bolt holes are reasonably close to center, the intake should seal. from what I have read in this post , I do not see a vacuum reading which [could] give some clues about a/the leak. I would carefully check the simple/basic fundamental things first. I know the cam will sometimes have an effect on " normal " readings however, many simple test can show increase or decrease in the established vacuum readings. while the engine is running ,simply placing your hand over the carb on the top and restricting "some air flow will either make the engine go rich and cut off or rev higher because of added fuel to a lean condition due to a vacuum leak.

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