There wont be any sources from before rome, just myths (which are sources in and of themselves). And besides Greeks and OG italians (before germanic invasions) share genetic similarity.
I know that people from the Island of Sicily are of Greek stock. They still have that heritage to this day. Different to the rest of Italy.
 
				 
 
		 
	 
  
 
		



 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		