vek

So does this mean I have parts from 2 different bike engines ??? (as I said I am a newbie to bikes)

Hi all I am a newbie here and to bikes, I have been given an old engine so I can learn how to strip down and rebuild. I would like to restore the engine ( if possible ) but as I dont know anything about engines I would like your help to Identify so that I can get a manual and source parts . Below are some of the picures I have taken as will will see the engine is in a pretty bad shape, if the engine cant be rebuilt at least I will learn something from stripping it down.