Villain: ~$650

Hero: covers

Villain has been playing fairly standard/taggish. We're both probably mid 20's. I've seen him ISO a few fishy players' limps and I have yet to see him limp yet. We've probably played a few orbits together and I don't think I've even seen him showdown a hand. Basically zero history. 

Folds to him in the HJ (shocking I know), he makes it 20, I 3b to 70 in SB with TdTc. He asks how much I have behind and calls after thinking for ~30 seconds. 

FLOP: KhJh5c ($150)

I bet $125, Villain calls after thinking for a minute or two

TURN: KhJh5c9c ($400)

I check, villain thinks for over a minute and bets $205. I jam. Thoughts?