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but were afraid to ask: 
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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
I've been working on detailing the engine bay of my '70 E-Type, and in the process of locating and correcting vacuum leaks I discovered an open vacuum connection under the mounting flange of the front carburetor. Though it wasn't connected to anything, it was obviously pulling in air. I assume its purpose was originally to operate the heat-sensitive air door in the air cleaner housing, (does anyone know whether this is correct?)but my car was changed over to Longflow air filters a long time ago.
Also, does anyone have any experience with the effects of a non-operational vacuum retard unit on the distributor? Mine hasn't worked since I got the car. Is it supposed to have a performance effect, or is it strictly related to emission controls?
I haven't been able to find any literature on the carburetion setup in this model...my Bentley manual doesn't have any information on the late Series II. Is there another source?
Also, does anyone have any experience with the effects of a non-operational vacuum retard unit on the distributor? Mine hasn't worked since I got the car. Is it supposed to have a performance effect, or is it strictly related to emission controls?
I haven't been able to find any literature on the carburetion setup in this model...my Bentley manual doesn't have any information on the late Series II. Is there another source?