What peak RPM are you going to shift the motor at? The 10 lbs per 1000 RPM works really well on most BB Mopars I have seen a 10 HP gain by reducing the oil pressure from 80 lbs at 6500 RPM to 65 lbs at 6500 RPM with 30Wt oil at 170 F I don't run straight 30 WT oil anymore as a results of that dyno session

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