Hi Jim !
Thank you for your suggestions,though I must say that my currant config is exactly like you reccomended...
The filter box from the carb has been modified and now is air-proof completely ,except a big whole in the upper surface in the center where fits the tube from the turbo.It is a week now
I ve finished the job with the turbo and cannot tune the carb!
I should check again if the air from the turbo duct bends the shafts and chokes like this the carb and the engine...