Thats a lot of oil you are burning through - I assume it is smoking like crazy and your plugs keep oiling up?
All I can tell you is that my 8n was eating up oil, the oil was always black and smoked like a chinese factory chimney - pulled the head and replaced sleeves, pistons and rings with a kit from here and with a new head gasket it ran without burning a drop of oil and no smoke.
I am not that much of a mechanic and got stuck on the valves as no matter what could not move the darn things - I now regret not going a bit further and taking the block down to have that done for me - my bearings looked to be in good shape so actually just bought a new set at the same size - might want to do the plastigauge test if yours look bad.
There was a member here who sent me a really good step by step description as to how to replace sleeves etc - sadly I have misplaced that.
If you have the head off I would definately take the thing to local machine shop to check for warping etc mine was only about $40 to get nice a flat again - just make sure it is not touching before you tighten it down by doing the grease trick.
I am sure others with far more experience will give further advice and comment on the oil pressure which to me seems low at start up cold.
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