Its pretty normal to find excessive oil in the up pipe and throttle body-
Does this car still have the 3/4 inch tube leading from the passenger side valve cover to the turbo inlet bell?
It will suck oil vapor from the valve cover, put it thru the turbo and puddle in the bottom of the intercooler-
You most likely dont have a bad turbo, pull the inlet bell 2 13mm nuts off the inlet bell and see if the turbo shaft and blade has excessive play, if it moves just a little, you will be fine- Just pull the intercooler out and wash it out with gas, clean the uppipe and throttle body-
As for the fuel washing, if the car was ran hard and then sat for a period of time, some of that fuel could be in the oil-
I would check the turbo, change the spark plugs to NGK UR5, BOSCH 02 sensor, replace the spark plug wires and change the oil and fuel filter.
Run it and see what happens, if it doesnt make any strange noises then drive it-
If the maf is backwards the plugs will foul instantly-
Pull the chip out of the computer and see what it is.
Does this car have stock injectors?
BW