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I had the same thought as Wayne, but I also noticed you asked some advanced questions (sprocket parallelism). To answer your question, I did not bother with sprocket parallelism issues. I just put the shims back where they were. Yes, all the rockers must be removed, and the shafts that hold them in are interesting to deal with, even on a bench. I have rebuilt my engine (I'm comfortable with tools), and if I were to change cams, I would surely remove the engine to do it.
On the other hand, it is a job you can do. You will need a dial indicator and the special (P-207) holding fixture. My cam upgrade, to 20/21 grind which is A.K.A. "964+" has made a huge improvement in the way this car drives. I can't say enough.
Oh, I think you'd use the 964 timing specs.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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