Stealing a pot with 43o

[bozlax]

I've only been at the table for a bit, but MP1 has played uber-tight, MP3 very loose-passive.

Party Poker 1/2 Hold'em (9 handed) converter

Preflop: Hero is BB with 4[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">1 fold</font>, MP3 calls, <font color="#666666">3 folds</font>, Hero checks.

Flop: (3.50 SB) 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, MP3 folds, Hero calls.

Turn: (2.75 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">Hero raises</font>

Once MP3 bailed on the flop, I thought I saw a chance to steal this from MP1 by raising the turn. My plan was to dump it if 3-bet.

Thoughts?