that's where the vacuum port for dist. vacuum advance is on the Carter TQ, so that's probably the same on the edelbrock.
As far as the idle speed, 950 seems a little high. The higher the idle speed, the higher the vacuum, so it can be a little misleading on the amount of idle vacuum. But a non stock cam can force you to raise the idle speed to smooth out the idle. How many turns out from seated are the idle mixture screws?
