Please explain. Is the carb still the OEM CAP item? Is the distributor correct for the CAP specs? I suspect that if either one, or both, of those items has been changed somewhere along the line, it might not be possible to match the specs on the label.
One time, back in the later '60s, we had our '66 Newport 383 2bbl (Stromberg WWC-3) at the dealership for a tune-up. When doing that, they splashed some Acrysol on the carb to clean the linkage and such. They also used a Sunn roll-around air/fuel ratio meter to do check the carb's operation. Once, I asked if they could adjust the idle to 14.2 air/fuel ratio. Sure enough, it made it with just a bit of turning of the idle mixture screws, which proved my theory on that. Idle quality deteriorated a little, so I asked to return to the normal settings (max rpm at the stated idle rpm spec). What I failed to do, back then, was to see how much turning of the mixture screws was needed to get to the 14.2 reading. When the rpm level was about 2000rpm (cruise), the meter swung to 14.7 just as it should, every time.
Just curious what you experienced when trying to hit the CAP idle specs.
Thanks,
CBODY67