Depends on temp 25-40psi. Tough to get the oil hot enough in a drag car. at 150 degrees its around 40psi. Even with a diaper on the pan. If its to low for your liking at idle you need pump with larger rotors (higher volume). The small rotors won't move enough volume at low rpm if there is a lot of internal leakage. Loose lifter bore, big bearing clearance, upper end not restricted. This motor would only make 40psi with the spring turned all the way up until the pushrods (pushrod oiling)were restricted from .090" down to .050". Personally if it comes up quickly off idle the idle pressure isn't that big a deal.What's it run at hot idle? My 383 was approaching 5-7 psi with 10w30. 15-40 got me up to 10-15. I was gonna put in this spring kit.
Doug