Flopped nuts but very vulnerable

[Alchemist]

Paradise Poker 0.50/1 Omaha/8 (9 handed)

You've only been playing for 1 orbit and have no real reads except that some of the players are terrible and could be holding about anything.

You are the BB and are dealt 7[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img]. Lots of limpers but no raisers. You see a free flop with 6 other players.

Flop: (7 SB) 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img]

SB checks to you.