Anyone try these distributors?

Mad Dart said
So on a Stroker where you need alot more INITIAL TIMING lets say 20-24*
you would need to limit the mechanical advance to 10-14* to get 30-34* all in at lets say 22-2400RPM MAX orrrrrrrrrrr you gunna screw some stuff up...........ping ping ping, boom!

How hard would it be to modify the mechanical advance? Is it hard to do, are there marks to help you or is it done by trial and error?
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not hard to change the curve.there is a plug in the housing you can remove and reach inside with needle nose and bend the 2 tabs on the advance plate.or you can access the whole thing from the top by removing a few screws and a snap ring.and the one i have the advance is all in by 2200.im running 18 initial and 34 total.no ping....oh yeah its done by trial and error,but not difficult.