Diyer,
Get us some pics of the machine and motor. That way, we can see what kind of shape it is in.
I have (4) 205-370 Adlers here at our plant and they all are not set up with Efka computer motors. This gave us needle positioner, air foot lift, air back tack, speed control. After having these functions on a machine, I do NOT want to go back to manual one. If it is a 3 phase motor on the one you are looking at, that could be changed with a phase converter. Do you currently have air at your shop now? An Adler 205 can be converted back to a plane jane machine with a servo motor. Hirose makes a very good clone bobbin shuttle. I use them on our Adlers. To bad you are not in the states. Allen at Weaver Leather is about the best I know of at rebuilding Adler 205's simply because he works on them everyday and has so for over 20 years. They rebuilt 2 of my 4 Adler 205's. Pictures will tell us a lot.
glenn