Gold Lifetime Member
Join Date: Oct 2001
Location: Londonderry, NH
Don't know much about Edelbrock carbs but to get cars with big cams and Holley's to idle, you sometimes have to drill small holes in the primary throttle plates. (less than 1/8")
The problem is, in order to get enough air for a good idle, you have to open the throttle past the idle/transfer slots in the throttle plate. By adding the small holes, you can get enough air in to allow proper idle mixture adjust.
Like DjD said, that's a pretty big cam. Don't expect to get much more vacuum out of it!