You begin by setting the static start timing so she will start, which is pretty close to fire right at or near TDC, and then the distributors spark advance mechanism (mostly centrifugal) determies tha advance versus RPM to match the engine and its compression etc.
Timing specs for distributors often say set it for x advance at x RPM and you can do that with a timing light butttttttttt remember when youre rotating that distributor youre ALSO affecting the static start timing.
If I have no manuals (the usual case lol) I set the initial static start timing first by getting the No 1 piston to TDC and adjusting the distributior so right there she fires. Then she should start and use a light to see where she fires as RPM is advanced and if its close I let her go or perhaps tweak it a bit but not so much the start timing is way slow or fast. It also depends on if its a hand crank or an electric start, the hand crank isnt very forgiving, one dont like kickback from too fast timing while too slow makes them hard to start. An elec start is more forgiving up to a point.
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