I am going to attempt to perform a valve job for the first time. The Pelican
Technical Article has convinced me that even I can do it.

While ordering the feeler gauge and new cover gaskets, I though I would
replace the vacuum lines at the same time. The car has been running lean and
it seems to be getting worse every time I drive it.

How much line do I need? What is the inner diameter of the line?

Since it is a vacuum not pressure line, I am assuming that I do not need any
clips or holders for the line. Right?

Porsche_beginner