Squeezed Light and Flopped a Draw

[AE6]

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($153.75)
SB ($209.75)
Hero ($146.50)
UTG ($63.85)
MP ($66.10)

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises to $4</font>, SB calls $3.50, <font color="#CC3333">Hero raises to $16</font>, Button folds, SB calls $12.

Flop: ($36) 2[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $23</font>, <font color="#CC3333">SB raises to $57</font>, <font color="#CC3333">Hero. . .</font>

Blah blah blah don't 3bet sc's if you don't know what to do here blah blah yadda yadda.

Villain is the same weird nit from my other post, donkbets a lot, has a 20 (!) AF. Fold? Call and stack him on a club turn? Push?

Also, how do you feel about my flop bet? It's my standard amount for a squeezed pot, but I realized right after getting c/r'd that the stacks are kind of awkward for it. What do you think about checking behind?