The "Throw Away 318"

Dave_J said
A high volume oil pump draws a lot more HP to run. Even with the Sanborn (RIP) oil port mods. You are trying to suck more thick oil thru the same size 3/8 ID straw pickup.

Better bet would be a standard pump with a new Kevco type pump cover that is a 5/8 ID pickup.

Then add a Crank Scraper to your pan to scrape most of the oil off the crank, not all but most. Even better is to add a 'Power Port" to the pan just under the Crank Scraper.

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A HV pump doesn’t take much more power to drive than a standard pump. The total oil used through the system is controlled by how many leaks you have and how much they leak. The HV pump will most likely open the bypass sooner unless the engine has excess clearance.