oil pressure question

My 440 when cold has 70 psi at 750 rpm. at 190* it drops to about 25 psi. I know the whole 10 psi per 1000 rpm, but my concern is the Difference in pressure from being cold to hot. Does this indicate worn bearings? These readings are with a high volume pump, and a bottle of STP.
I built this engine 20 years ago.