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Thanks Billjam, but Porsche930's car is a 1978 USA, which has a completely different throttle body. The early model cars (1976 - 1979 EURO, USA and ROW) have throttle bodies that can be recognized by the two vacuum ports that angle off to the right when viewed standing behind the car. This is clearly seen in the pictures that have been posted.
I used the diagram in the workshop manual for this model year and engine, so I am quite sure the connections I described are correct. I would like to post it here, but I think it is against the rules. If this is incorrect, please let me know. I think it would be helpful for others as well.
I recommended leaving the backside port vented because Porsche930 has lost his cut-off valve. It is connected to the air injection system, so many people discard it, not realizing that, on these early cars, it also connects to the distributor and performs the full boost retard function as well.
If Porsche930 backs off 5 degrees on his static timing, and leaves the boost retard port vented, he should be safe. That is similar to how the EURO cars are set up; they do not even use the boost retard port.
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