[LateFlag]

Call.

Obviously you aren't folding. The reason why you don't raise is because if villain is bluffing, he's not paying off your raise. If he has a 6 (which is sort of what he's representing), he's 3-betting and you'll be forced to call because the pot is gigantic. I will grant that sometimes he has something idiotic like KJ that he should know isn't good but doesn't and you'll feel mildly stupid for just calling, but considering his overall range (6s, bluffs, oddly-played Ks) I don't there's a lot of value in a raise.