Igor, pulling and swapping engines is easy to do.... you can rent an engine hoist on wheels that works with hydraulic lever to pull the old engine, after disconnecting all the obvious connections, radiator, etc.

Good running 240 engine should be easy to find in MN as the engines often outlast the car. Shouldnt cost you more than $500. Junkyards should be able to locate an engine through their own network, even within 200 mile radius for really good low mileage engine.

Stick-shift 240s are big ticket item. Since you stole the car, none of your money will go down the drain. And immense satisfaction will be gained from building your own Benz.

Otherwise, I wouldnt bother with old engine run dry.... thinking other problems can occur down the road.