In that type of carb, the IFR's handle the fuel in the transition circuit.

""when you open the throtle the a/f goes to 11.5 11.7 this seams to rich""

""if u drive the car at steedy speed it will run 11.5 all the time""

""pig rich at say 2500 rpm in fourth up to 3000 rpm""

It depends on how your carb is setup, but going by your above description, your mains might not be starting until around the 3000rpm mark. If this is correct, than the IFR's will make a big difference in A/F ratio and the IAB's will make a smaller difference for tweaking.

I am currently having the opposite problem as you are. I am very lean on the transition circuit (15.6-16.6 A/F) and I am waiting on some larger IFR's to come in UPS so that I can tune that problem out.
I can watch the A/F ratio start to richen up as the rpms got into the 2700-2800rpm range and then by 3000-3100rpms, the A/F ratio richened up into the 13.8 range where I believe my main circuit was starting in. My mains appear to be a tad rich while my transition was 1.2+ too lean on the A/F gauge.