I left the original springs in mine and it's all in by 1800 RPM.Its perfect for a street strip car like mine, it gives you plenty of lead time to get the car moving so you don't get any low end detonation.
Gus

7822960-moriaburnout.JPG (98 downloads)
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60