440 Camshaft recommendations for up to 6-6,500 rpm?

Now back to your camshaft, there are a lot of variables but shooting from the hip I would be looking at something in this range. 323 are a little tricky running up that high on the RPMs because of the long gears work against a peaky cam. There are faster cams out there no doubt but this would have good Street manners and longevity. Just my two cents

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