There are some Motobecane catalog scans on Velobase.com; maybe that will help. Nice bike by the looks of it; not top end but definitely not junk. Depending on the age the threading might be French or Swiss. Whoever keeps this bike should give it a good overhaul and fresh grease so those bearings stay fresh.

What did you mean by "alignment"? Leaning a bike against a wall for 30 years shouldn't bend it. Are you talking about the frame, wheels, or what?

Edit: Here's the Velobase link: http://www.velobase.com/Resource_Too...alogScans.aspx

2nd edit: The 1979 super mirage looks pretty close.