Unhappy 360 (At idle)

If it's still acting up, isolate the intake tract from EVERYTHING else. Do not hook up any vacuum actuated items at all. Plug all ports off at the manifold/carb.

Runs the same, it's not any of the other crap hooked up. Runs better, hook up one thing and see if the performance changes. Cap that off, then go to the next item. You may find the culprit (PB boosters are a likely source along with PCV) until you narrow it down.