underpair in 3bet pot, flop play

[nazahl]

villain is unknown, since Ive just recently gotten back to 200nl. he paused for a couple secs before betting the flop and then leads weak.

Full Tilt Poker, $1/$2 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

MP: $80
CO: $88.65
Hero (BTN): $195.25
SB: $82.10
BB: $298.40
UTG: $570.05

Pre-Flop: T[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/club.gif[/img] dealt to Hero (BTN)
3 folds, <font color="red">Hero raises to $7</font>, SB folds, <font color="red">BB raises to $20</font>, Hero calls $13

Flop: ($41) 7[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">BB bets $24</font>, <font color="red"> Hero raises $63 </font>

this is a spot I used to flat call a lot of the time but have started experimenting w/ raising to fold out 6outers. obv. folding to a shove if he bombs it.

merits to calling over raising?