No that pressure is fine and about what I used to get with 5mm of washers.
(my top was a touch over 90 though but that was the axle grease I run <10/60>)
The oil system can handle that pressure easily. I would use Castrol European Formula 0W-30 (aka German Castrol) in that motor - you can get it at AutoZone or PepBoys...more info in the Lube section. Might want to read the Motor Oil 101 link in my sig.
Yes, you should see a slight drop in pressure using GC.
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