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That's about where you want to be with a 331. When you start playing with durations, you move the powerband either higher or lower. You can add more duration, but it may make the engine softer on the bottom than what you want, and may actually put the top end up in a spot where you get into valve float issues.
Here's what I would recommend....
On a hydraulic roller, no real reason to keep the idle up so high. If it idles at 850-900 without issue, then let it idle there.
It it labors to idle it that low, and it sounds too smooth for your preference when you idle it up, then you have the option of going with a custom cam. This would keep the same duration, but we could tighten up the LSA to make it sound "healthy". This would probably add a little broader torque curve to your engine as well.
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