vacuum advance

Just to cover the basics but are you sure your running to a ported source and not from the carb base,the vaccum ports on the carb base pull full vaccum.Also you do need to disconnect the vaccum advance at idle to get a true reading of your base timing.You can run the advance to full vaccum at idle but you will need to restrict/limit it so you dont have too much timing or an erratic idle.Running this way smoothes the idle with a large cam,gives better driveability and runs cooler while idling but probaly isnt neccesary with your cam.