I have a couple of questions regarding the vacuum advance and the hose hook-ups for a 1969 Z/28 with the 30-30 cam. I had the valve lash settings done using JohnZ's guide from this website. My cars initial and mechanical advance settings have been set to 11 degrees initial and 36 total all in at 2,800 rpm. My car currently does not have vacuum advance hooked up, and I want to set it up as JohnZ describes in his article using manifold vacuum.
First question: When I set my car up like this the idle went up to around 1,400-1,500 rpm. Is this normal? Without the vacuum advance it is between 900-1,000. Is all I have to do is adjust the idle speed to 900-1,000 with the manifold vacuum hook-up?
Second question: What do I do with the nipple on the AIR diverter valve? As far as I know my AIR system is operational. Can I leave the nipple exposed or should I put a plug over it? Is their something else I need to do regarding the AIR system?