Bottom 2 against unknown

[Choparno]

Basic check-up hand. Just sat down so no stats or reads. Are we happy to play for stacks against an unknown on this board or do we call flop and proceed with caution?

2/4 NL, 6 players

Stacks:
CO ($1235.30 in chips)
Hero (BTN) ($400 in chips)
SB ($480 in chips)
BB ($400 in chips)
UTG ($400 in chips)
MP ($387.50 in chips)

Pre-flop: Hero is BTN with J[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
3 folds, Hero raises to $14, SB calls $14, 1 fold

Flop ($32): K[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img]
SB checks, Hero bets $25, SB raises to $56, Hero decides SB could be raising with top pair or a flush draw and raises to $180, SB raises all-in $466, Hero calls