Overpair vs either a River Bluff or slowed monster

[halsted]

I dont have a hand history So i will type this one out.

Villian is Pretty crazy, seems to be tilting. But he is not a complete lagtard. I stacked him about 20 hands ago. He also makes huge bluffs with air. So im guessing either complete air or boat +.
Also, I play at about 37/24/2.

4/8 I have 2K he has about the same

Hero: KK

Raise 24 Villain calls from the Button

Flop: Q-J-R Rainbow
pot: 60~

I bet 42~ he raises to 270~

I call

Turn: Q (off suit)

I check He Checks

River: Blank Baby

I check he Pushes ~1100 into 600~