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A lot of the NHRA Mopar SB racers use the non high volume oil pump and the standard bypass spring,

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Non high volume with standard bypass spring???
Do they come with different spring pressures? Then what are the springs they put in high volume pumps? Sounds like you can get options on springs with either pump, Please explain?

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All the SB high volume oil pumps I have used, many years ago, mid 1990s, had high pressure springs in them that would make between 70 and 80 lbs of pressure before they would open the bypass. Most of the stock type SB liked to be shifted between 5500 rpm and 6500 RPM so there was no need for more than 65 lbs of pressure with hot oil.I have bought the high voume pumps and switch the bypass springs to the standard pressure springs, Not really the correct thing to do, buy the standard 318 pumps and check them over carefully and use them if they check out okay