You can do it at home. It is time consuming. All the distributor machines do is spin at designated rpm and display advance. With a timing light that has advance and tach functions (this makes it easy), you can make a chart of advance per rpm in about two minutes. If not note the advance at a certain rpm displayed on the dash.
The time consuming part is taking the distributor apart and dremeling the peg hole (with carbide bit) for advance plate. Bigger hole-more advance. Braze up hole-less advance. This will take care of end points.
Sometimes you can stretch the mounting tabs for the springs for more tension on springs. This will lower the curve a little. Similarly squeeze tabs together less tension on spring- curve rises. For more drastic changes go to a spring supplier (home depo, lowes, or that online supplier beginning with an "m"?).
For similar effect, but much more work, you can weld material on weights to steepen curve.
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