I can only speak for the Chevy at this stage.
We were used to installing either a 40 psi or a 55 psi by-pass spring in the pump, meaning that you won't have higher pressure readings than this when hot.
At 300 rpm, or so, not at idle.
Make sure you replace the
oil filter after the first warm-up. The lubrication grease from lifters and cam gets stuck in the filter up to the point of no pressure left if the filter is clogged and you have no by-pass at the filter.
That is why I like the FRAM HP4 having a by-pass. The one in the block was blocked.
good luck,
Dominik