5/10 NL...Underfull w/ very deep stacks

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Villain in this hand has $4277 and I cover. Game is 6 handed 5/10NL on Prima. Villain is somewhat loose passive (40/5/1.5), but he seems to showdown strong hands whenever he shows aggression postflop.

I open 4 [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/club.gif[/img] for $35 UTG. Bad player calls in SB. Villain calls in BB.

Flop Q [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/heart.gif[/img]

Both check. I bet $80. SB folds. BB calls.

Turn J [img]/images/graemlins/club.gif[/img]

BB checks. I bet $200. He minraises to $400. I call.

River 7 [img]/images/graemlins/spade.gif[/img]

BB checks. I bet $750. He calls and MHIG.

A few questions.

1) Should I 3-bet the turn?
2) Is my river bet size OK?
3) If I'm C/R'd on the river, it's an easy fold right?