That guy is REALLY brave tuning some of those car with stock blocks. 680 hp on a STOCK 5.0L is driving on borrowed time leased by wal-mart who then leased it to a mexican restaraunt.
I dont think he actually does the tuning, he offered to assist me with my tuning if I could datalog and send him the files and he would tweak and send back. I think he helped Darkshadow tune his car but he doesnt do and dyno tuning.