Whunter,
About 60K miles ago, I replaced all chain guides, timing chain, oil pump, strainer, oil pump chain and tensioner ,Rebuilt heads, all engine seals except rear main seal. cam oilers (then again about 10K miles ago). As far as the other things you mentioned, probably not all of them but anything I thought it would need. Oil pressure is still good above 1000 rpm, it is just a little lower at idle (500 rpm). My question is if 8 psi at 500 rpm is too low when the engine is at about 200 deg F?
When oil pressure drops any at all with nothing but an oil change, I get nervous.

Paul

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84 500 SEL (307,xxx miles)