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I really don't understand your post. All I can tell you is that the original engine probably suffered some sort of problem, so rather than fix it, they installed a used engine. The engine they bought to replace it happens to be a 1972 911E motor. All motors of that type had MFI.
Perhaps what you are saying is that the MFI injection components were removed and replaced with the CIS components from the original engine. If that is the case, it's not a good swap. A 911E motor is going to be worth a lot more money if it has it's original injection components, it would run better with it's original injection than it will with a different system that was never intended to be used on it (god knows what they would have done to adapt it) and the correct 911SC engine would make more power and torque than any 911E motor.
JR
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