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I would say your pressure is ok, considering what is done to the engine.
What is the hot idle oil pressure, lbs at rpm, ie: 10 psi at 1000rpm.
When the max oil pressure occur at 45 psi at 2500 rpm? Or higher speed?
620hp sounds like fun.
An old, but still very good rule of thumb for oil pressure is 10 psi per 1000 rpm is enough.
This is a Chevy rule as well.
Oil flow is more important than oil pressure.
We could have tighter bearing clearances and have 90-100 psi, then we have overheated bearings and more drag through the engine trying to operate a pump at that pressure.
The readings won't matter whether you are in gear or not, 3000 rpm in neutral should be the same as 3000 rpm driving, as long as the oil temp is the same in both cases.
Redline? What rpm does it produce the 620hp at?
Let's say 6000, I would have a rev limiter of 6200 to be safe.
I hope my advice has been of assistance to you.