NL50 - double combo draw on turn

[Scuba Chuck]

Villain seems to play like a regular. Plays tight, raises on button to isolate fish. Afternoon game, if that matters.
Villain is 22/12/10 over 80 hands to this point.


PokerStars No-Limit Hold'em, $0.50 BB (4 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($50)
UTG ($53.40)
Button ($9.75)
SB ($50.45)

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, Button calls $0.50, SB completes, Hero checks.

Flop: ($1.50) K[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $1.5</font>, Hero calls $1.50, Button folds.

Turn: ($4.50) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3.5</font>, <font color="#CC3333">Hero raises to $12</font>,


I assume standard fair here is to call. Any reason not to raise? I'm prolly calling a shove getting 1.8:1