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Your vacuum pot is not a vacuum advance, but a vacuum retard.
With it connected and functioning, it will retard the timing about 10 degrees. So if you are checking it with the vacuum line disconnected, it should be roughly 5 degrees before TDC.
BTW, that's too high static compression ratio to run with T cams. I would have the cams reground to E, and set them at the retarded end of the spec.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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