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Bob,
I am not sure that the terms "volumetric efficiency" and Model "A" should be used in the same paragraph, let alone the same sentence.
As I am sure, there are many critical factors in the design of an engine, CR alone does not make an efficient engine.
In my opinion, the basic intake port arrangement and crank layout makes it less efficient. And this is just one small aspect.
The stk "A" is rated at ~40HP, or .20 HP per Cu Inch displacement.
With some massaging, it can easily be raised to .50 HP/CID.
Most changes made have a point of diminishing returns, after CR, intake and Cam.
Enjoy and experiment, that is almost as much fun as driving them, John