Can anyone offer me some assistance?  I have just purchased my fisrt Subaru and i am unfamiliar with what is interchangeable and what is not.  The engine is tired has had the heads off and welded before and has oil leaks.  Can i possibly fit a later model liberty engine with out too many dramas, it is just a daily driver for my wife so i dont want to spend too much money or time doing a conversion but would like good reliability. Thanks