1/2 interesting river spot

[BT2]

PokerStars No-Limit Hold'em, $2 BB (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

UTG ($38)
MP1 ($124.35)
MP2 ($152.35)
CO ($209.40)
Button ($154.75)
SB ($644.50)
Hero ($200)

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">SB raises to $6</font>, <font color="#CC3333">Hero raises to $20</font>, SB calls $14.

Flop: ($40) 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Turn: ($40) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $24</font>, Hero calls $24.

River: ($88) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $30</font>, <font color="#CC3333">Hero ?


villain is 18/8/3.4
i do not have a clear range for what he would have called my 3bet with. i figure on the river he either has AK, a set, or a weak club and wants to get to a showdown. should i bluff this?