2005 gmc envoy 5.3 engine problems

[KostikaEnvoy]

Hey guys, i would like to ask for advice or help from you. I have a 2005 gmc envoy denali 5.3 v8 i drove on the highway and all of a sudden i saw smoke coming from my muffler and it start knocking. Im trying to find an engine for it and having difficult time. does any one know by any chance if i could fit or use like the gmc sierra, yukon, avalanche engines? thanks for you time and would appreciate your help

or any sites where i can buy over size pistons, rods, bearings, valves....