What oil pump to use?

I took my approach to bb engine oiling from Herb McCandless . #1, the hole that feeds the main bearing comes from the oil gallery . It is a 3/16ths" stepped hole to restrict flow to the mains . Herb suggested to drill it all the way (long drill) to 3/16ths". #2, fully grooved main bearings "P" series .#3 Milodon or Moroso 7quart pan and pickup. #4, start with a standard volume Melling pump . #5, monitor oil pressure during break in and if oil pressure does not go up after break-in and run in , go to a high volume pump . Because of grooved main bearings expect lower oil pressure than you would think . #6 experiment with different weight oils until you're happy with the pressure at the finish line . In my case oil pressure was low with 10w-30 and standard pressure . After about 3hours of running time and an oil change oil pressure went up to 25 lbs at idle (1000rpm) to 55lbs at 4800 lbs. Herb is a genius with bb's and Hemi's.