Jaws, in order to change out the coil packs you would have to get 4 msd blaster coils and run seperate coils for each cyl. It is because of the waste spark. MSD does not make dual output dis packs as of yet. you would run two of the coils in parrallel to make it work. ON the old beta like onpol said will need the tach adapter. I am not sure if you are running an aftermarket ignition like the msd. If you are I do have that tach adapter laying around. I am not exactly sure what onpol meant by dual tach adapters.