hey,
im using an N/A head on my TD running 18psi boost and LOTS of fuel. i dont have an egt gague that works so im not sure of my temps but im assuming its pretty high considering my oil temps sometimes. its been on for a little over a year now but the boost and fueling mods have only been done in the last 2-3 months. i havent had a problem since i had it on but that doesnt mean there won't be one in the future. i wouldn't use it on an all out race car but just for driving i'd say you shouldn't have any problems.
Mark