Anyone try these distributors?

mygwenevere66 said

they are adjustable,is just not real precise .there are 2 tabs on the advance plate that can be tweaked to limit total advance.the one in the link is not a procomp but the procomp parts will interchange with it(advance springs,cap ,rotor ,etc.).they come with 20*mech advance.all in by 2200 on the sb version.

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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?