You've probably wasted a lot of money replacing all the components you mentioned!

"White smoke" is condensed water vapor droplets in the exhaust (The primary exhaust constiuents are H2O and CO2.) and is common during warmup in cold weather. Once the engine is fully warmed up, particularly at relatively high sustained load such as freeway speed, there should be no visible white smoke.

If you place your hand under the exhaust outlet after a cold start it will become damp, and you might even be able to see water droplets dripping out the tailpipe. When fully warmed up you should not get condensed water on your hand or see water droplets at the tailpipe. If you do, it's an indication that there is an internal coolant leak such as a failed head gasket seal, and you will notice that the coolant level drops with mileage. Normally it should not drop between coolant changes.

IIRC the ignition advance resistor on a W124 is near the master cylinder, but I'm not sure. On my 190E 2.6 it's on the inboard side of the battery compartment - a pigtail wrapped up with electical tape and secured with a wire tie.

Duke