Hi Tomguy: The line does have vac. it will stick to your lip when the car is running. Also The diaphram does work when you suck on it.
But isn't it true, that if the timing is set too advanced already then removing the vac retard line will show very little difference.
The reason I,m saying this is last week when the car was really screwed up, I remember setting the timing as retarded as possible and when the vac line was removed the idle went up. Then turned the dist. to advance it, then removed the line again it had no effect. Right now with all the work being done and set to TDC ( can not get to ATDC) when the vac line is removed there is some increase idle but not much.

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.