very simply put,what modifications would I have to make to install a 2004 5.3 engine into a 2005 yukon with the same 5.3.Everything is bone stock.I have the old 05 engine to rob if I need to.The 05 engine is tired with 288000 miles and hardly any oil pressure.I found a nice 04 5.3 with only 61000 miles on it.Thanks in advance for the help