Pertronix makes an electronic unit that replaces the points in your original dizzy.
You can take a '75 and up HEI from a 250/292 and modify it to work in the older sixes.
A separate oil filled coil will run cooler and last longer that the epoxy ones that are in the cap. Cap mounted epoxy coils can transfer alot of heat into the electronics were you don't want it to be. Not that I've had any problems, but for those running the '75 and up dizzy, you might want to consider changing it to the cap with the separate coil. It's entirely your decision, though. I'm happy with my coil in cap. HEI will always perform better than points and is worth doing based on mine and others experience.
