Tuning with jets, Power valves and an O2 guage

I decided to change the jets in the 850, now I'm up to #90s. With the carb off, I decided to check the idle air bleeds. It turns out they were PLUGGED! After a few seconds, each one cleared out and carb cleaner poured through the idle transfer slots! There are 8 air bleeds. The outer 4 exit into the idle transfer slots. The inner 4 must exit into the metering blocks or somewhere else because they flowed, but I couldn't see where.
With the bigger jets and clean air bleeds, the car responded well. The A/F numbers improved!

Idle in park: 13.0 to 13.8
Idle in gear: 12.8 to 13.5
Power brake: 12.0 to 12.9
Great news! Now I'll try some #89 jets and fiddle with the idle mixture screws. I may be able to road test tomorrow!