I know that your setup is not normal. The 66 setup uses 3 2gc carbs the end carbs have no provisions for idle. Is it possible for you to send pix of the setup. Having built lots of setups over the years. I found(like carb king) The early 2GC's have no ID except for the tag. 99% of the setups have lost the tags. 68up carbs have ID and ALL 2GC have interchangability. Plus Other lines used the same carbs (Olds tri-power).
CFM should be the last of your wories. Getting the setup to run without problems should be your first priority. Lines/fittings and past(as mentioned) modifications can have Major effect on your setup. Changing Blades and shafts could have a adverse effect on the running of the setup. Running the setup in a late Firebird will require a large hole in your hood. The front carb will hit. No air cleaner will clear at all. Had a friend go through this.
I'm not trying to scare you but is it worth it. Most 4BBl intakes will do a better job.
You have a better choice of carbs. Most will fit under the hood.
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