Pete,
What model is this QF carb?
I run the SS-750-AN. I have tuned this carb over the last five years with dual O2 sensors and I can't imagine how rich it would be if the four corners were adjusted to 1-1/4 turns out each!!!!!! It is a QF carb and not a Holley! The QF tech told me to try and keep the Four Corners Screws between 1/2 and 1 turn out each.
The floats should be about 1/3 up the sight glasses and no more than the half way line. This is a QF carb and not a Holley!
Is the carb setup to the specs that was sent with the carb?
If I was you (I did this too when my carb was brand new from QF), I would remove the carb, drain it, and take it apart and wright down all of the jets, PV size, and air bleed sizes and take pictures as you remove each part. The pictures are great references later. You should also remove the needle assemblies and clean them out. You might have some crud in the one and blow them out with carb cleaner. Use carb cleaner in all of the holes that you find. When you put the PV back in, torque it to 100 INCH/lbs so you know it will not leak. Then flip the carb upside down and adjust the throttle blades to show a square hole on both of the throttle blades and the idle circuit slots.
Once you KNOW what you have, then bolt it back on the intake and set all four metering screws to 3/4 turn out and start it up. Set the float levels to 1/3 to 1/2 up the sight glasses. Then wait for the engine to warm up to the normal running temp. This should get you closer to a decent idle.
Note:
It is very hard to tune a carb without some type of feedback from an O2 sensor.
