240d Revival

[ggspeed]

a guy i know has three 240ds, all w123s. Right now they all sit and he will most likely be willing to let them go for a good price. One has only 100k on it has a newly installed manual tranny, and is dencent shape, other then a "shot" engine that was run out of coolant. out of the other two. The bodies are both in bad shape, and one wont start (he doesnt know what is wrong with it) The other will start, however has a shot rear end(thats his diagnosis) and can run, but doesnt drive.

If i was to get all three of these cars how hard would i be to do an engine swap from the running one into the manual tranny "good condition" car.

Is this more trouble then its worth? I figure between three cars there should be enough working spare parts to make a beater out of at-least one.