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Though the older marketing says otherwise...in practice, I've seen and heard of them both ways. Sorry, just passing it along.
Though Mopar specified the parts and marketed the engine...the better springs were not really required for the 300 to run well, and Cummins was known to deviate from the bill of materials at times.
Pull one spring and pressure check it, compare to the recommended spring and go forward 
easier visual reference is the MP .525" springs the crates are supposed to have are 1.4" OD straight springs, the stock mag springs are behives with a ~1.1" OD retainer...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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