What RPM is it idling at? Like mentioned above, the pressures you gave are close to the minimums. I would run a bit thicker oil....15-40 or something.

I just bolted on the billet Milidon pump and their low-profile, baffled roadrace pan. I'm sure my hot idle pressures will be up now.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)