400NL - Villain 3-bets from SB. What to do?

[SimonAllan]

Early on in a session, I haven't played any big pots before this hand. Villain runs at 21/14/2.8 over 800 hands, and the only note I have is that he 3-bets preflop more than his stats suggest, without being insane.

Party Poker No-Limit Hold'em, $4 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($405.40)
SB ($625.10)
BB ($454)
UTG ($692.12)

Preflop: Hero is Button with 6[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $16</font>, <font color="#CC3333">SB raises to $55</font>, <font color="#666666">1 fold</font>, Hero calls $39.

Flop: ($114) 4[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $99</font>, Hero calls $405.40 (All-In)

I guess the main question is what I should do preflop, and if I should pass, what hands should I continue with here. I think that the flop plays itself, but if anyone disagrees, I'd be interested in hearing why.