Thermoquad idling issues

I pulled the carb apart and found the floats set about 3/16 low. Reset floats to 29/32, and cleaned out all passages. Found the idle screw about 3/16 of an inch shorter than another Thermoquad I had laying around.

I was able to get the car running with the idle mixtures about 4 turns out. Car idles around 850rpm. Is this excessive for the idle screws? They sure seem long winded. The tree is set around 1.75. Seems to be rich at an idle, but that could be my cam.