The GM Hotcam with the matching springs is a mild cam if you're not looking for too much. These were going for pretty low prices a while back and LS6 springs are pretty cheap too. My first dealings with an LS motor was a 226 cammed 6.0L and it pushed my truck to a 12.8 in the 1/4mile(probably could have gone much faster with that setup, but I moved on).
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