An update on the running problems: the distributor shaft was quite badly bent. It had 0.010" runout at the cam. Since the points gap is only 0.014-0.016" this seriously messed up the dwell and timing with big changes on a cylinder-to-cylinder basis as the shaft did a full rotation. The points being set too wide didn't help.
With a good, used shaft with 0.002" runout, and the points set at 0.015", dwell was right on the money and she's purring now.
Malcolm
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