$600 NL, bluffing a river block bet

[wpr101]

Villian is aboug 25/8 over 70 hands. WTSD is 31%. Is this bluff +EV?

PokerStars No-Limit Hold'em, $6 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($1093.55)
UTG ($261.15)
MP ($591)
CO ($588)
wpr101 ($948.15)
SB ($405.75)

Preflop: wpr101 is Button with Q[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $18</font>, wpr101 calls $18, <font color="#666666">2 folds</font>.

Flop: ($45) J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">CO bets $36</font>, wpr101 calls $36.

Turn: ($117) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">CO bets $106</font>, wpr101 calls $106.

River: ($329) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">CO bets $116</font>, <font color="#CC3333">wpr101 raises to $486</font>, CO calls $312 (All-In).

Final Pot: $1185