Big Block Tunnel Ram 660s Questions

Every Holley 4 barrel I have rebuilt has had light escaping past the throttle blades. Loosen them slightly, as little as possible to keep the flattened end of the blade screw as intact as possible, so you won't have a screw come out.. I have on occasion taken a small flat punch to "reflatten" the tip of the screw. Once you have done that , you will have a good starting point for further adjustments elsewhere.