The 560 had a 30 degree advance, 656 22 degree, early 706 25 degree, next 706 still with 263 had 22, 291 had 17 degree (or 19 can't remember for sure). Early 706 you still set full advance at wide open throttle to 22 degree btdc. When IH came with an engine improvement package for the 263 in 706 the pkg included new complete distributor. The total advance is controlled by one limiting hole in the advance plate on shaft. The curve is controlled with the springs. The curve is far less critical than the total advance and I have tweeked many with a little pliar pinching of the ends of the springs.
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