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Holley 390 cfm/4160

Holley 390 cfm/4160
Oregonite

Oregonite

Jeeper
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Sweet Home Or
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'74 CJ5 258 3-speed, Dana 44 posi rear-end. Holley 390 cfm. Offy Aluminum intake, header, HEI, K&N
Has anyone that is running a Holley 4160/390 cfm carb and an Offy intake on a AMC 258 i6 / 4.2l AMC had any luck dialing in the secondaries? If so, which color secondary spring worked the best for you?
 
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