How widely does he defend pre? This is important, because you need to know how many K5/K4/K3o combos he defends.

Not a believer of his turn line. He likely c/r A2/76/sets and he doesn't have 62, so he's essentially repping that he now has two pair, on the king turn.

On the river he can still value bet two pair, so I would not make the assumption he has a straight or air. You have zero deuces in your range, and the only 7x are 76 which may 3-bet turn, 77 and 7x w/FD.

Given that his value range is still pretty wide, you can fold this, and call with better bluff catchers.

calling is probably a better option than bluffing, but folding is likely the best with this hand. You'll have a handful of 7x n 2x straights to not fold on the river.  Q5s seems to far down in your range to be making a call unless you really think he's going bananas on turns+rivers