Weird PLO river spot w/ two pair + naked ace.

[LearnedfromTV]

Relevant stacks: SB $2900, I cover by a couple hundred. No read other than that he seems mediocre.

PokerStars (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is Button with 8[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].

Blinds 25/50

UTG calls, <font color="#666666">3 folds</font>, Hero calls, SB (poster) completes, BB checks.

Flop ($200) 8[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Hero bets $200</font>, SB calls, BB folds, UTG folds.

Turn: ($600) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $600</font>, SB calls.

River ($1800) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $300</font>,

He has 1800 left. Folding seems disgusting, yet I'm very likely beat. Just call or bluff shove?