I have a hyd. cam set up with no resrictors and a standard volume oil pump, when cold with 10-40 or 20-50 W oil I see it reach 90 psi, once warm and running I get about 60 psi driving droping down to about 35-40 at idle (800 rpm). Hope this helps. What weight oil are you running (I guess 30W for cam break in).?
69 Sportsroof, 351C, 4spd toploader, Restomod BOSS 429 clone - the one and only (?) 1969 BOSS 351
Actually, I'm running 20W50 as well. I was told by my machinist (who races many cars as well) that 20W50 is the oil he uses at all times. He said to run the motor at 2500rpm steady for 10-20 minutes if it doesn't overheat and then 1500-4000 up and down for 5 minutes. Then while its hot remove the valve covers re-torque the head bolts and set the lash to the proper specs. Cam specs say .022 for the lash. He said to set the lash at .026 or so until the initial break in period is over. Then drain the oil.