Hey there Jimmy. I can certainly assist you with ID'ing the Benelli / Motobi bits you've acquired. I've restored, raced, re-restored, and collected Motobi for nearly 20 years, and have a real passion for the mark(s). I currently have a Zanzani Motobi vintage racer, and a Motobi Catria Sport 175, as well as various motors and parts from 50cc bikes up to 750's, as well as vintage Ducati, Laverda and other bikes.
Feel free to email me with your list, and if you have pictures, that always helps. There are many distinguishing characteristics among the "egg" motors, their case widths, side cover cutaways, case designs, and several other tell tale items that are subtle unless you have a fair amount of familiarity with them...same with the frames and other components.
Hope to hear from you. Chris in New Jersey.