FBO's black HEI ignition box

I know people talk about the high RPM retard on some of these ignitions as if it's a bad thing. It's not always. If you have a combination that's on the ragged edge (as is all the rage these days) you may find high RPM retard desirable. You don't WANT the timing as far advanced as possible at high RPM in some of those combinations. It might be a recipe for disaster.