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Paul-
I don't believe that the .990 was CIS-E. I think it was LH-SFI (and 3.2 liters), but am not positive.
Your statement about the 3.0 L .980/.981 being simpler is probably the case, but those early M104s with ASR/Cruise Control do have an electronic accelerator pedal. It probably isn't exactly the same as that which is on HFM-SFI engines, but I believe it is pretty expensive, too. (I think I have heard they are not even available now.)
Also, BOTH the M104 3.0 liter and 3.2 liter (as well as the 2.8 liter) engines have variable intake cam timing. I suspect that the lower torque curve of the 3.2 liter is a more a product of the cam grind, duration and lift, plus the increased displacement.
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