[jb9]

I think you should fold.

You don't have enough chips to check raise and still have chips left over to play with if he calls. And I wouldn't want to end up all in with this hand at this point in the tournament. Wait for a better opportunity.

If I wanted to play for this pot, I would have bet out on the flop (150) and folded to a raise and check/folded the turn or river unless I improved.

That's my usual line if I think I can pick up the pot after connecting with a ragged flop from the big blind. I take one shot at it, and then let it go. With your chip count here, I don't think I'd try for this pot.

P.S. If I have a set of threes, I call his bet and bet 3/4 of the pot on the turn and get all in on the river.