NL600 Bluff, am I repping good enough?

[GLmaestro]

Villain is a multitabler (maybe 2p2er, screenname DonRobertNL) with 26/14/1,75 stats.

He has been C-betting a lot, and i decide on the flop to make a move:

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

saw flop|<font color="#C00000">saw showdown</font>

CO ($156.28)
<font color="#C00000">Hero ($684)</font>
SB ($594)
BB ($387.50)
UTG ($1795.47)
<font color="#C00000">MP ($796)</font>

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $3.
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to $22</font>, <font color="#666666">1 fold</font>, Hero calls $22, <font color="#666666">2 folds</font>.

Flop: ($53) T[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP bets $36</font>, Hero calls $36.

Turn: ($125) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP bets $70</font>, <font color="#CC3333">Hero raises to $140</font>, MP calls $70.

River: ($405) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, Hero calls $486 (All-In)


What do you think? Am I representing a strong hand here (like A6, TT, overpair) or does it look like a bluff?

Also, what hand would you call this river with if you were villain?

Thanks