My straight faces a huge river bet, please comment!

[SW4Y2NITE]

***** Hand 821138155 *****
1.00/2.00 Texas Hold'em (No Limit) - 9.11.2007 22:03:11
Table TH 695 (Real/Cash Game)
Seat 1: crif (143.78)
Seat 2: JustBluff (212.45)
Seat 3: Fis-herman (153.35)
Seat 4: dzired (345.76)
Seat 5: mtcargo1 (280.50)
crif post SB 1.00
JustBluff post BB 2.00
** Deal **
crif [N/A, N/A]
JustBluff [Jc, 9c]
Fis-herman [N/A, N/A]
dzired [N/A, N/A]
mtcargo1 [N/A, N/A]
*** Bet Round 1 ***
Fis-herman Fold
dzired Call 2.00
mtcargo1 Call 2.00
crif Call 2.00
JustBluff Check
*** Flop(Board): *** : [8d, 7h, 10c]
*** Bet Round 2 ***
crif Check
JustBluff Check
dzired Bet 8.00
mtcargo1 Call 8.00
crif Call 8.00
JustBluff Call 8.00
*** Turn(Board): *** : [8d, 7h, 10c, 7c]
*** Bet Round 3 ***
crif Check
JustBluff Check
dzired Check
mtcargo1 Bet 10.00
crif Fold
JustBluff Raise to 40.00
dzired Fold
mtcargo1 Call 40.00
*** River(Board): *** : [8d, 7h, 10c, 7c, As]
*** Bet Round 4 ***
JustBluff Check
mtcargo1 Bet 164.00
JustBluff ?????


Im really puzzled about what to do here. Please tell me your opinion about this! All comments are really appreciated!