My
oil pressure will drop to 45 psi when the
oil is above 210 F on the track. I have a fairly fresh 351W built by KCR ( 6000 miles). I called Keith to discuss it and he did not seem overly concerned by the pressure when hot. The bearing clearances were purposely set a little looser then factor specs according to my build sheet. That was about 3 years ago and it has not caused me any problem. The engine runs like a champ.
I did switch to syn 20-50 which bought me about 3 psi above 210 F
oil temp. I also replaced my electric oil pressure gage with a mechanical but they read the same.
Once a year I sample my oil and send it in for analysis. No problems so far.