91 Cavalier & 90 Beretta

I have a 1991 Cavalier V6 and Im thinking about buying a 90 Beretta GT V6 they both have the 3.1L, I was wondering what parts would fit the beretta and which wouldn't. Is the Corsica/Cavalier/Beretta the same car with different bodies?

This won't answer your question totally but, Corsicas and Berettas are close enough that they share the same Gm service manauls, Chilton books , Haynes manuals, and many parts are interchangeable. Cavaliers are never mentioned in those specific books. They have their own. Don't know what the big differences would be, as I have owned Berettas and Corsicas, but not a Cavalier. I suspect most of the Cavalier stuff is slightly smaller. Motor may be same or close though if they are both 3.1s. Biggest difference I have seen on those is some are multi port fuel injected, some use throttle body. Do some research on the web, perhaps Advance Auto site (nice to use for many parts) and many online body parts companies offer web shopping. Try certain parts and see what is matching that way....