He's 200BB deep you realize?

I think you played it fine up until the river. This is not a good spot to bluff. You were right to assess that by checking the river, he most likely had a weak holding, like a low two pair or AJ, and 200BB's deep these hands probably won't stackoff.

However, the problem with bluffing here is what your hand looks like, a busted draw. This is the most common bluffing spot in poker, and one that most people know of and will probably call you down on. I'd just check behind the river and hope he had a missed draw.

And one more thing, this hand becomes very very tough if your opponent shoves the river and you hit one of your draws. If you hit your T, you probably would have to fold (very marginal) to a strong river bet. If you hit a 7, it's an even toughed decision but you probably have to call because of the donktastic play or 25NL. If you hit your flush and he shoves, you'd have to cry and call and hope he's a donkey.