Springs determine how quickly the advance comes in, the slot length determines total amount of mechanical advance.
Do you have the stock weights? The original springs are so strong, that you need a screw drivers to release them.
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1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
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