Good catch! And no apology needed. You read it right. I remembered to double the advance numbers but not the rpms from the chart.
Brian, those should read
0-400 rpms -- TDC (that's about as low as you can hope for it to idle) 1200 rpms -- 34 BTDC 1600 rpms -- 40 BTDC (which is pretty much the wide open running James referred to when setting timing)
And D Slater's note about modification over the years might explain any variance you find from those numbers, too, when you get it running right, as well as the slop from wear that James cited.
Sorry, Brian, for the confusion. But we're all still on the same page.
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