Is their a reason for choosing only the Ignitor I system?, if a Pertronix II or III system is available for your application, they are better system with additional options, either way, spend the money on a NEW Pertronix Ignitor Flame Thrower coil for your application, they offer epoxy filled units in a stock appearance black finish, or chrome plated coils, choose the correct OHM and turn rating needed for the system you choose...take the ballast resistor out of the system for better reliability/performance

mike