Marginal 2 pair vs fish

[Tanky]

Villain was almost impossible to read, he triple barelled with 44 on a K high board earlier, but also check called down my triple barrell with a flopped nut straight vs my set as if he couldnt read the board, aswell as various other strange moves postflop.

Do you agree with the turn check to keep the pot small and allow him to fire whiffed overcards on the river? And with this river do we have to call?

Party Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

Hero (CO): $24.20
BTN: $25.30
SB: $24.92
BB: $27.24
UTG: $49.53
MP: $25.35

Pre-Flop: 7[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] dealt to Hero (CO)
2 folds, <font color="red">Hero raises to $1</font>, BTN folds, SB calls $0.90, BB folds

Flop: ($2.25) 7[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $1.70</font>, SB calls $1.70

Turn: ($5.65) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, Hero checks

River: ($5.65) 8[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $3</font>, Hero calls $3