$22: Do I pass on this stealing oppurtunity?

[outofstep]

Should I steal here? I raised that much because each had <10 BB. Can someone tell how me how one calculates the EV of this hand? Thanks for all the help.

#Game No : 3033154151
***** Hand History for Game 3033154151 *****
NL Texas Hold'em $20 Buy-in + $2 Entry Fee Trny:17398311 Level:3 Blinds(25/50) - Monday, November 14, 00:29:39 EDT 2005
Table Table 68101 (Real Money)
Seat 1 is the button
Total number of players : 5
Seat 1: Hero( $1165 )
Seat 4: Shilloy ( $515 )
Seat 7: lisapinkpant ( $310 )
Seat 8: LVNC21 ( $4885 )
Seat 10: zarvik ( $1125 )
Trny:17398311 Level:3
Blinds(25/50)
** Dealing down cards **
Dealt to Hero[ Ac 4d ]
LVNC21 folds.
zarvik folds.
Hero raises [300].