Ok, I got the car back yesterday. $340 for timing chain and chain tentioner replacement. Thats labor and parts together.
Now the question is - Is this too cheap ?! My roommate was amased since his Audi's timing belt was around $500 (just the belt and labor) That made me think that may be something is fishy here. Is this proces easier to do on MB's than other cars?
As far as girgaling kit, I asked my tech and he said that they fix it without instaling it. The proces involves juking up one end of the car (front I think ) than opening some valve and leting the liquid out while the car is tilted upwards. That shoul eliminate the gigaling sounds.

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)