overpair on scary board

[LAgambol]

10/20 NL
Villain is more on the passive side. decent at best.
Hero has been playing LAG
BB has 3.5K, Hero covers

villain in MP limps, Hero makes it 80 in CO+1 with 99, BB calls, villain calls

Flop:
8 [img]/images/graemlins/diamond.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] 2 [img]/images/graemlins/club.gif[/img]

villain checks, hero bets 140, bb folds, villain calls

Turn:
7 [img]/images/graemlins/diamond.gif[/img]
villain checks, hero bets 250, villain calls

River:
3 [img]/images/graemlins/club.gif[/img]

villain bets 600

thoughts on all streets appreciated