2001 Chevrolet Impala bad mechanic

Help me if u can tore down my chevy to replace head gaskets car was running fine until it was put back to gether my guy got messed up on push rods way over torquing tried to start but way to tight rechecked positon of push rods also he didnt get rockers like they came off what should I do car is still sitting will run but really missess sound like a bunch of loose lifters use to sound what do you think I have damaged