Correct internal or external coil for pertronix points eliminater

..oops, pushed the wrong key. Crane LX-91 57:1, Accel 140009 70:1, Accel 380876 85:1, MSD 8207 70:1, MSD HEI coil 70:1.

The sec voltage used to ionise the plug gap is usually [ & should be ] well below the available sec coil voltage, what is left is reserve voltage. CT magazine did a comprehensive test years ago on coils/ign. Even when plug gap was increased to 060, the reqd sec voltage did not increase from 28kv that a smaller gap reqd. This will vary.