600# @ .720" lift. And then you haven't said how high your lift is. I suppose it is a secret, which is okay. I've run my Comp Cams 829-16 to 280# installed 780# open @ .800" lift.
setting at stop lights w/ 90-100 degree heat, idling, is a lot diff. than high rpm w/ a lot of oil splash for short periods of time, w/ a non direct feed lifter. 829-16`s are not direct feed.