Is this standard? Fold river?

[VickreyAuction]

Original PFR was 27/3/.5 over 170. He's not the main villain in the hand.

CO, the main villain, was unknown. I had 5 hands on him.

PokerStars 3/6 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, CO calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero 3-bets</font>, MP calls, CO calls.

Flop: (9.33 SB) T[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP calls, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP folds, CO calls.

Turn: (8.16 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, Hero calls.

River: (12.16 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero calls.

Final Pot: 14.16 BB

I almost folded the turn. (I didn't realize that I had a gutshot; basically a reverse professor77). I figured I had enough outs vs two pair, but I underestimated how easy it is for him to have a straight here (Q9, 98, 9 with spades).

Anyone fold the river or do something differently?

Anyone not 3bet PF vs the 27/3 over 170 guy?