Here's a page from the people who orignally made and sold 'em. This is from the Installation Instructions pertaining to the following: 6200 MSD 6A 6246 MSD 6A For odd fire v-6 6400 MSD 6T 6446 MSD 6T For odd fire v-6 6420 MSD 6AL
p4 Installation Instructions
MSD 6 Series Multiple Spark Discharge Ignition
Form 1498, revised 09/92