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read the FSM and chose the oil weight according to recommended pressures hot & cold, at idle and at 3500-4000rpm.
Although your pressures seems way too low for a rebuilt engine (unless you did not change the oil pump - which mean you now have to). I highly doubt it has to do with larger clearance, unless again they are way too big.
nissan recommends 11psi min for idle oil pressure when hot, and 160°F is not "hot", 200-210 is. I cant remember the hot running window, but 15psi per 1000 rpm up to 4000, then 60psi is the way to go on most engines.
TBH i would not run the engine with such low oil pressure. I think your engine has a problem, not one caused by loose clearance, more like dead oil pump. What is the idle pressure when cold ?
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