TPTK Facing c/r on flop early in 400k multiway action

[SEAN.R.R]

Only reads are on pf raiser who raised utg with kqo first hand and has raised 3/5 hands after that.
Full Tilt Poker
No Limit Holdem Ring game
Blinds: $10/$20
9 players
Converter

Stack sizes:
UTG: $3310
UTG+1: $2850
MP1: $2160
MP2: $3150
MP3: $2970
Hero: $2530
Button: $2970
SB: $2980
BB: $4080

Pre-flop: (9 players) Hero is CO with A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/club.gif[/img]
UTG folds, UTG+1 calls, MP1 folds, <font color="#cc0000">MP2 raises to $60</font>, MP3 folds, Hero calls, Button calls, SB calls, BB calls, UTG+1 calls.

Flop: J[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] ($360, 6 players)
SB checks, BB checks, UTG+1 checks, MP2 checks, <font color="#cc0000">Hero bets $300</font>, Button folds, <font color="#cc0000">SB raises to $820</font>, 3 folds, <font color="#cc0000">Hero???