overpair faces aggression on raggedy board, easy fold?

Villain is 42/0/.93 PFA over 30 hands. Without such low aggression I would have called.

PokerRoom No-Limit Hold'em, $2 BB (5 handed) internettexasholdem.com

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

UTG ($87.10)
MP ($68.50)
Button ($21.50)
SB ($67.60)
Hero ($98.60)

Preflop: Hero is BB with 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, SB completes, <font color="#CC3333">Hero raises to $5</font>, SB calls $4.

Flop: ($10) 6[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $6</font>, SB calls $6.

Turn: ($22) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $14</font>, <font color="#CC3333">SB bets $56.6 (All-In)</font>, Hero folds.

Final Pot: $92.60

[PoBoy321]

Looks standard to me.

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Looks standard to me.

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Would you call if his aggression was more typical, say 2.5 ish?

The problem is there are no mediocre hands worth your opponent betting with. Your either beaten or it is a bluff likely with a draw. If you don't think your opponent bluffs then I don't see a need to call here. You want an aggressive opponent that bluffs with draws to consider calling. This is not likely a stone bluff either since he check called the flop and check raised the turn. What hand would you do that regularly with? Not too many unless your some kind of maniac.