'Performance' Distributor?

Jim Kueneman said

FBO Distributor Limiter Plate & Spring Kit

Use the lightest springs in the kit, put the plate on "10" and set the timing with the vacuum advance disconnected to 30-33 degrees (I use 30 do to the Az heat and 20+ mile hill climbs for detonation, 33 can give a bit more power).

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Set it to 30-33 degree with the engine at a high enough RPM so that the weights are full advanced. With the light springs it is a much lower RPM than with the stock. At idle the timing will be about 18'ish degrees. That one is not as important. The important one is with RPM high enough that the weights are fully advanced.