Glad I stumbled upon this informative thread.
I thought I had gotten my weber tune (48IDAs on a crate 302) to 95% on my CAV.
Idles well, with just an occasional stumble at 2800, but my exhaust and plugs are still black; even after changing the idle jets from 65 to 60. I guess I have the stock 37mm venturis and after reading this, I think I'd like to try the 40s and go down even more on the idle jets to 55.
So where can I order them?
edit: never mind, I saw the link to dansperformanceparts.com. Ouch! Almost $200 for 8!