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The way I look at it, the lighter the car, the lighter the spring to use....even more so with a lower rearend gear and an efficient combustion chamber. For the Cobra engines, I always put the lightest springs in. No need to mix and match, bring it in as quick as you can. As for total timing, you really need to experiment if you're trying to get the most out of your engine. My 428 liked 38 degrees total....others I've seen were happy with 36. You just have to tinker.
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