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John, not sure what you mean here. I know late SCs pulled a vac under load, the vac advance for the distributor. only works with the throttle open. Or am I misunderstanding you?
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OK, See -- you already know more about the CIS 911's then I do. What I would find interesting is to quantify the amount of vacuum across the rev range under load.
Here's a simple for example...
If a 911SC with CIS pulls .95 atmospheres (14.7psi * .95 = 14.0 psi) with the stock CSI and generates 200 HP, then the exact same motor using a mapped EFI system or MFI with no intake restriction should make (200 / .95 = ) 210.5 HP by virtue of getting a full 14.7 psi of intake charge at peak HP.