[Big_Jim]

I'd probably c/c here.

If he has a K, he'll most likely check, and you can bet and expect a call on most rivers. If you bet, you're probably not gonna get two streets of value, unless he is looking you up real light.

Plus you get some money from his floats, if he has one.

If he does have the flush, you can stack him if the board pairs (probably via c/r, but this depends a bit on his turn bet)

If the river blanks off, you have a few options, but mostly I'd check/decide, almost always calling. You can block if you think it will work, but I don't like this spot for that, cuz I think it looks super weak.

Of course, you risk the board four flushing/straighting, but I'm not really worried about him drawing here. If he was drawing, he probably already has it.