I dont know of any but I havent looked... I play with
the dist in a few different segments.. first when on
the engine I figure out what the engine wants for
base timing then what the engine wants for total timing..
then I put the dist on a dist machine(I have access
to a old one).. I test it for when the timing starts
to come in at(thats adjusted with the springs).. then
I test for the total mech advance.. thats adjusted
by the slots... the last dist I got has adjustable
advance with just a simple screw(I believe its a MP
part).. but if you have slots then its weld up the
slots to limit the total mech timing.. the vac pot
can have too much travel and pull more timing than
needed and you can adjust that travel... if you want
to slow the vac to the can you can get small in line
vac restrictors to slow it down but it just slows
it.. the vac advance is more of try it and see thing
since your not on a dyno.... but if you think about
using a stock dist on a modified engine your increasing
the base timing and all of the numbers move up by
that amount(difference of the stock base timing to
the new modified base timing) so that dist need to
be modified