Holley 4150 way to high idle.

-Assuming you are correct when you say all butterflys are closed: Did the pcv line or brake booster line get accidentlly dislocated or cracked?
-Its also possible that the PV is ruptured.
-Curb idle screw and cam dont belong in the same sentence for 4150s
- with closed blades the nozzles should absolutly NOT be flowing