I used a twin pickup system developed by Chrysler back in the day. It involved grinding a hole in the pump cover and brazing a pipe nipple on. Then a hose to another nipple welded into the bottom of the pan with an internal pickup. Twin pickups worked like drinking a milkshake with 2 straws instead of one. It was easy to do on the b block Chrysler because they had external pumps. Dont know how you would ever do that on a Chebby except to possibly increase the size of the pickup tube? I always ran the pressure low, 40 or so (40,000 miles on a 383 that I wound up to 7800 often). Two times I ran the 1/4 mile with no oil on purpose! Desperate times desperate measures.