I think you will need to find a locking differential for the car, from a 560SL. I have an '82 380SL with a 560SL engine in it, and in the rain it breaks traction every time I step on it. Very annoying. It will do it while accelerating in second gear, about half throttle. It REALLY needs that locking differential! Your engine will make more power, and will spin the tires even more easily.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C