Hey Steve,,    I know you did a lot of research on what PVC vale to run on your rig.  Have a little trouble getting idle right.  Believe the PVC valve is not right.  Running 4177 Holley, right now running 67 primary jets will go back to 71s seemed to be better, also using secondarys to control idle.  331 stroker, John's heads, Engle Cam #EP-20-Cam lift 321--duration 231--  lobe centers 110.   Blue Thrunder.   Pvc valve that I'm using is for a 289 Mustang. Maybe too big??     Thanks for all the help thru the years.   Still the Best site!!!    God Bless    Eddie

Eddie

Lake Forest, Ca. 92630