Sounds like your motor is done but if not, grind the flashing inside the block and paint the valley. Oil running back to the pan faster helps. Dual filters w/w/o oil cooler also adds capacity. Stock eliminator SB Mopars usually spin 6800-7500 rpms with a stock pan. Some run an accumulator, most don't. A tab or two in the pan to keep the pick up covered when de/accelerating should cover your needs. Good quality oil at the right level and changed frequently should do it.