50NL - River bluff vs random

[Hail Eris]

Villain is some 30/0/1.5 fish who's been calling and folding to cbets a lot. His AF is highest on the river. I'm running at like 20/17/4 and have shown down good hands. I figure he has busted spades a lot but I can't possibly call, so I do this instead. Any merit to it?

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($136.30)
Hero ($91.70)
SB ($73.25)
BB ($56.30)
UTG ($50.10)
MP ($111.75)

Preflop: Hero is Button with 6[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">1 fold</font>, BB calls $1.50.

Flop: ($4.25) 8[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $3.5</font>, BB calls $3.50.

Turn: ($11.25) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: ($11.25) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $4</font>, <font color="#CC3333">Hero raises to $14</font>,