Opinions on 85 300GD engine condition

Looking for opinions on the symptoms of this engine:

Oil consumption: 4 qt 900 miles
Lots of oil in air filter assembly
Oil leaking out of oil fill cap
Oil leaking out of manifold side valve cover bolts
Oil Pressure 7 lbs at full temp idle
Oil pressure 65 lbs at speed (60mph) warm
One con-rod knocking
At idle rod knock not real noticeable
Mileage unverifiable, but supposed to be around 90k

Whaddya think?

Any other info you might want to know - let me know

Thanks!

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