low oil pressure on rebuild

[drew1987gn]

Hi Jack. I'll try to keep this short. Had my motor rebuilt 7 years ago from a local guy that is highly recommended. Just started it this past weekend. Life's been busy, however, I primed the motor, started right up and ran it for 20 min. for cam break-in. My oil pressure after the motor warmed up was at 20psi at 2,000 rpm. I still need to set my IAC but I'm concerned that the oil pressure is too low. I don't have a high volume oil pump. Does this seem low for oil pressure or is this normal for the buicks? THANKS

Andy C