Just a couple of thoughts -
I think most of you guys are too concerned with
oil pressure and not concerned enough about
oil flow.
Having a bigger crankcase will not keep the
oil cooler, it will just take longer for the oil you have to heat up. If you want cooler oil you need to add an oil cooler.
Just for the record, my Windsor from FMS never goes below 50 PSI when in motion and that's using 5W-30 Redline usually running around 180 degrees.
Bob