Was This Draw Played Well?

[bluewilde]

Trying to be more aggressive with draws, but I don't succeed here. Is this a good level of fighting back, or between being afraid of betting without a hand and knowing I'm supposed to be a little aggressive with draws like this one did I just strike at a new level of "whaaa???"

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (6 handed) converter

CO (t770)
Button (t520)
SB (t790)
Hero (t745)
UTG (t665)
MP (t4510)

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">4 folds</font>, SB completes, Hero checks.

Flop: (t60) 7[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t30</font>, <font color="#CC3333">Hero raises to t70</font>, SB calls t40.

Turn: (t200) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: (t200) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t100</font>, <font color="#CC3333">Hero raises to t250</font>, SB folds.

Final Pot: t550