well, first thing is you are in position, not out. second, i would almost always 3bet this in this situation, 3 handed, sb opening into bb. it's probly correct to 3bet nearly ATC, and KJ is way way way ahead of ATC. you flopped a monster basically. i'd be trying to put as much money in the pot as i could. i think your hand is way too strong to be playing this passively. raise flop and you aren't put in this situation on the river. here ... i dunno, flip a coin.