By the way... who says a 930 motor and "long version" trans won't fit in a plain old 911? I have a feeling that it will all fit
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Probably can do, however you would need to move the trans mounts and torsion bar suspension tube forward to get the motor mounts to line up or move the motor mounts rearward for the trans mount to line up. The factory moved the motor mount location rearward to fit the longer1978 transaxle in the 930 chassis making it a little more tail happy and changed the recommended tire pressure from upper 30s to 43psi to compensate. Easiest way is to use a pre 78 930 trans or machine a later one to the earlier dimension.