sounds like a similar issue i once had, turned out to be powervalves. Look closely at each of your power valve assemblies and ensure that not only the valve butterflies (pulleys) are turning, but also the power rod. Lightly jiggle each butterfly and look closely at the rod to see if it is moving, if theres slack between the fly and the rod, it will hamper power at 10k rpms (or anywhere for that matter)

You could also try cleaning the points, maybe even swap the coils around for a splurt
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