I have a 2001 file but no 02 file. If you go to horist's site and just download a 6.0 stock tune, he doesnt have one posted for a 5.3L, but the 6.0 is probably a bit closer to what you have. Just modify the stock cylinder size and set it to OHV 5.7L and your good to go. You might wanna go get a LS1 or LS6 file also and copy over some of the idle and airflow/spark tables to get you started.
Chris