2/4 - rivered nut flush on paired board 160bb deep

Villain is an aggro regular, running 21/19/4.3. I stacked him 150bb deep earlier this session on a big cooler (my turned str8 over his turned 2 pair in a 3 bet pot). That was awhile ago though so I doubt he's steaming.

Full Tilt Poker - No Limit Holdem Ring game - Blinds: $2/$4 - 6 players - Converter

Stack sizes:
UTG: $521.55
Hero: $706.40
CO: $981.70
Button: $800
SB: $988.30
BB: $643.60

Pre-flop: (6 players) Hero is UTG+1 with J :diamond: A :diamond:
UTG folds, Hero raises to $14, 2 folds, BB calls.

Flop: 3 :club: K :diamond: K :spade: ($30, 3 players)
BB checks, Hero checks.

Turn: 8 :diamond: ($30, 3 players)
BB bets $30, Hero calls.

River: 4 :diamond: ($90, 3 players)
BB checks, Hero bets $60, BB raises to $245, Hero...

gotta call because you cant get value from worse often and you cant fold because his range is sooo narrow

Folding and raising suck so I guess that leaves you with one option.