2/5/10 hand - bottom 2 pair trouble

2/5/10 hand:

hand: 96s

Hero position: Straddle

villain: BTN, rec, no real reads other than seems kind of loose but definitely recreational

Folds around to BTN (villain) who raises $35, folds to me on straddle I call. Heads up.

Pot ~$70

Board: Jd9d6s

Hero check, Villain bet $35, Hero raise $120, Villain call $120

Pot: $310

Turn: 3c

Hero bets $250, Villain calls $250

Pot: $810

River: 8s

Hero checks, Villain bets $650, Hero ??

I think I put myself in a bad spot by raising flop with bottom 2pair.. should've probably just flat and let him bet into me with his TP hands. he seems uncapped here, can have a lot of missed draws hes betting here with but him calling flop + turn seems like he has TPTK+.. maybe some flush draws. I think TP checks behind on river and he's only betting with 2pair+ and missed draws.. question is if he has enough missed draws in his range to call here