Carb experts Please help

I hooked up a vacuum gauge to full vacuum and at idle (900 rpm) shows about 8 to 9". The carb is dry inside at idle and I can see the idle slots above the closed throttle blades. The motor has 20 degrees initial timing in it. I opened the rear blades up 1/4 of a turn then readjusted the idle back down and reset the 4 mixture screws. They are about 1/2 turn open. That is where the motor runs best while adjusting them. The cam is pretty lumpy with 240/246 duration at 50. I'm going to run this setup a while to see how it works.