Hi guys. I have a 1965 thunderbird 390 restoring to original including replacing the 650 Holley with the original 4100 Autolite carb. I rebuilt the 4100 100% using a kit, but it will not idle smoothly. seems to run ok on the primary and secondary barrels, and the accelerator pump, secondary actuator, and choke are fine but it will not idle smoothly. turning the idle mixture screws in and out all the way does nothing, at idle fuel drips from the primary and secondary venturis onto the throttle plates making an unnatural spitting sound. I know that's not right. all I have read says that the idle circuit is not functioning, I have cleaned out all the hidden passages and orfices in the idle circuits 3 times and can't get it to idle, the vacuum is down to 19 inches, should be 24 inches, so I know there is a leak somewhere but CANNOT find it. I sprayed WD40 around the base of the carb no leaks were found. Any more ideas ? I have tried all the usual tricks 3 times, still can't get it to idle. !! thanks in advance for your wisdom.