The E34 is a stout RWD not a 2700 lb FWD, so low traction handling is going to be just a little bit different. 
Hard, large-block summer tires will handle like crap no matter what their strapped to in inclement weather.
That being said, an E34 shod with 15" Firestone Winterforce or Bridgestone Blizzak is a very driveable car in the snot.
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