I used the stock 1970/71 6 quart Hemi and 440 six pack oil pan with the stock 440 6 pack 3/8 oil pick up in my old street pump gas Duster that I shifted at or above 7000 RPM in 1 and 2nd gear and it would rev at or above 7000 RPM in high gear in the 1/4 mile with no oiling issues with loose rod and main bearing clearances (.0032+ on the rods and .0040+ on the full narrow groove mains)and 5W20Wt oil as long as the oil level was above the add mark before the 1/4 mile runs If it was at or below the add mark before the 1/4 miles passes it would start to loose oil pressure when I let off around 200 to 300 ft. past the finish line, adding oil to bring it up the full line fixed it