Hi, - 'Smithy' is correct - the turbo will have an effect on the carb's ability to provide the correct mixture. From your pictures it looks lke the turbo is pullng through the carb. This is the easiest method for low to medium power applications.
Your engine is being over-fuelled - more noticable at idle, but almost certainly it will be rich at all speeds and power levels. This is always a danger when matng engines and turbos that were never designed to work together.
Don't know how far into the workings you want to get, but to make this perform properly, some calculations will need to be done regardng throughput, and for that you will need to know what power level and RPM you are aiming at. Then the correct jet sizes can be calculated, which may or may not be 'do-able' with the carb as fitted.
I appreciate that you bought this mean machine 'as-is', but do you happen to know what the capacity of the 'donor' engine was? Something around 700CC would be great.
I suspect that your engine is being 'over-boosted' - if you ae reading 10 PSI boost at idle, this is confirmed. In essance, the turbo is boosting and and trying to make the engine accelerate but you are holding it back with the throttle. Is the turbo fitted with a waste gate?
There are 2 ways to solve this - basically adjust the boost to match the engine's requirements (which is the function of a wastegate), or re-jet the carb (smaller jets) to compensate. If you go for re-jetting, this MAY result in a lean mixture at full throttle - particularly as there only appears to be one adjustment screw.