my 390 has about 400 miles on it since rebuild, cold psi cruising is 55-65psi
cold idle 20 psi
warmed up in gear 4psi, put in nuetral and goes to about 9psi, no noise, no issues clean oil, jump right back up at touch of throttle
using melling high volumn pump, also have the holley jets in oil passage to help slow flow to upper end, crank is turned .010/.010 on mains and rods