Straight draw push

[betgo]

From round 1 of a WSOP double shootout. I know I am supposed to fold preflop, but I have 15xBB and there is a lot of loose play going on.

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) converter

BB (t1115)
UTG (t1440)
UTG+1 (t2480)
MP1 (t1110)
MP2 (t1510)
MP3 (t1440)
Hero (t310)
Button (t2850)
SB (t1245)

Preflop: Hero is CO with 6[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t20, <font color="#666666">2 folds</font>, Hero calls t20, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (t80) 5[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets t20</font>, BB folds, MP1 folds, <font color="#CC3333">Hero raises to t290</font>, SB calls t270.

Turn: (t660) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

River: (t660) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t660

Villain had 5s4s and called with a pair of 5s. I had a 42% chance of winning the hand when the money went in. Was villain just a loose fish or did my push look like a draw or a steal? Should I have just called or made a smaller raise?

[bkbluedevil]

I know you said the call preflop was bad so I won't touch on it much except just to say you need a much deeper stack to play it profitably IMO.

If you are going to play it this is a good flop and I like the push.