Pay attention to the requirement of the signal wires from the distributor must be run separate from the remaining wires from the MSD box. Don't run everything in one harness or there is a chance of interference and you will get a corrupted signal to the box. That will change the timing at high revs and make for a bad day. Other than that, adding an MSD is one of the easiest thing you can do to your Porsche, at least that's my experience.
Lindy
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