Reluctor Phasing

i agree on that part. whats troubling to me though, is i have four extra main shaft assemblys from a 74, 76, 79, and 87 smallblock distributors, and not a single one is the same clocking position for the reluctor roll pin to rotor clocking slot. all of them were close, yes, but none of them were the same....i know the 87 is a different monster than the rest, being from an ECU setup, but the 70's ones were all from single pickup, ignition box setups, and had the same reluctor. why would they vary throughout production? i just don't get it....did the factory play horseshoes and hand grenades? :dontknow: