If you look at stock or other after market intakes The runners are level to the Plenum floors on Carbed intake systems. The ruuner Lenght is ALSO part of the over all Plenum volume.
And I have to agree on the Removable top plate That's the way I am redoing my tunnel Ram.
And Seeing that Your Faking a few of the Carbs is A pretty cool Idea, It will leave Many woundering Why so many carbs to start with,I had the same idea at on time. Hehehe
Now as to another small Question is the Runner and Plenum size, The Bigger they are the easier it will be to Lose signal to the carbs and You would also Lose the street ablility Or low end Power & tork. The Intake should Be in tune with what your going to be running for a cam shaft. A good example is my tunnle Ram The cam i was running was about the smallest that could have Worked with it. anything smaller and I don't think it would have even Idled. Seeing that It was Made for this New Motor of Mine. But I guess you could say I lucked out when it came to driving The car at Local Meets or street cruises.But it sure worked out fine On the track.