I shoot for 10 Lb. per 1000 RPM, IE 65 Lb. at 6500 RPM with hot oil up
I now use 5W20WT on all my street and strip engines and I have seen 18 Lb. at 850 RPM with the oil temps at or above 180 F, 40 Lb. at 1200 RPM when revved up a little and it still had 65 Lb. at or above 6500 RPM up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)