Deep Stack Turn Bluff, fire second bullet on river?

[theordinaryboy]

A$2/3 NL at aussie millions

7 handed hero has Ac Jh villain has $700, hero just covers

utg villain = i have just moved to this table as my table broke up, villain is loose pre-flop and likes to "see a flop" so calls raises after limping out of position quite often, of the few hands i have seen him play he has shown done good hands most of the time and seems pretty solid, however, when i came to the table villain and the guy sitting next to him commented on my stack size to each other, and i got the impression neither of them were keen to play a hand for stacks.

Pre-flop: villain calls, utg+1 calls, hero raises to 20, 4 folds, utg calls, utg+1, calls

Pot 65 3 players Flop = 9s 7s 2c

checked thru

Pot 65 3 players Turn = 7h Villain bets 40, utg+1 folds, hero raises to 120, villain thinks for a long time then calls.

Pot 308 2 Players River 5c villain checks, hero bets 150???

River 5c