I don't know much about which engines will work with what years but can I use a 05 shortblock in a 02 car and not have to change anything but the heads?

You shouldn't have to change the heads either as long as it's a non-AVLS motor. There are some weird California models from '05 that would not work. The pistons are different. If it has drive by wire that's an indication it will not work for your application. There are also some changes that were made to the PCV system around 01/02 IIRC but you can get around it.

 

GD