I run a full Duraspark ignition system. I also use the dizzy from a 1985 Mustang GT 5 speed car as rotorr22 and Krazy Comet suggested along with a 45,000V coil. The following hokey video should provide you full details on parts and installation. I've also attached a wiring diagram.
yeah.. they're called SADI cores. The hydro roller market is completely saturated with them. Premium and racier stuff gets into the billet cores. Easy to tell true billet shafts by the smooth turned shaft sections between the lobes.