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Stuart,
The MSD 6530 has a nice feature in that it will average the manifold air pressure signal over 2, 4 or six engine revolutions. This should help in smoothing out an erratic manifold air pressure signal. If this does not help enough, then I would suggest trying a TPS.
Another thing to notice is that at 1,000 RPMs I have a little v-notch in the timing curve. This notch also helps stabilize the idle, as well as help off idle drivability. This notch BTW is not possible with most non electronic distributors.
If the centrifugal advance springs are too light, they can lead to surging ...
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