b3b semibluff with a gutshot?

[thac]

Villain is Tonne2nice, and he's been fairly active so far. Our shove would be another ~820 on top of his raise. Is pushing here out of the question?

Poker Stars
No Limit Holdem Tournament
Blinds: t15/t30
8 players
Converter

Stack sizes:
UTG: t935
UTG+1: t7915
MP1: t4055
Hero: t1285
CO: t3785
Button: t2515
SB: t1210
BB: t3030

Pre-flop: (8 players) Hero is MP2 with A[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img]
3 folds, <font color="#cc0000">Hero raises to t90</font>, CO folds, SB calls t75 <font color="aaaaaa">(pot was t135)</font>.

Flop: 3[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] (t210, 3 players)
SB checks, <font color="#cc0000">Hero bets t120</font>, <font color="#cc0000">SB raises to t390</font>, Hero ????