963B with blowby 9000 hrs. Advise pls

I bought a state owned 963B that has a fair amount of blowby, the machine has approx 9000. I bought the machine for a pretty discounted price, knowing it had this issue. Any suggestions on what route to take on correcting this? Or run it until to much loss of power & oil consumption? It's a 3116 Cat motor of course, don't know past history.

Thanks men!

963B with blowby 9000 hrs. Advise pls