[Haupt_234]

Looks good, but I would bet the river. It is very doubtful he has a 3 since he would have shown so on the turn, and it is unlikely he has an ace given that he has called both the flop and turn.

So, he either has a FD, a queen, or a pocket pair. A pocket pair will most likely pay you off if you bet, you won't get any value from a FD either way, and you split the pot with a better queen anyway.

Edit: Or a 7, which pays you off. (I forgot the obvious)

Haupt_234