Rate this bluff 10/20

[emil3000]

Opponent is defenitlyhot on the OnGame network. He is IMO very good, aggro, reads hands well, pretty tricky. We have some history with bluffs and stuff, and he has been getting the better of me (though honestly he's probably held over me as well). This session I've already stacked him once after flatting his button raise from BB with 99, CR 723 twotone flop and getting it in against his 75. So he doesn't give me a ton of credit.

Anyway stacks are like 2,7k but not too relevant.

4handed, he limps SB, I make it 60 with K8o, he calls. Flop is A92 rainbow, he checkcalls 100. Turn is an 8 which brings a flushdraw, check check. River is an offsuit 7. He bets 202 into 320 , I raise to 750.

Thoughts?