Ignition boxes - worth it for the effieciencies

I meant to mention that I converted my Valiant to the GM 8 pin module in prep for going throttle body EFI, likely with eventual ignition timing control too. I don't have any of the computer control stuff in place yet, just the HEI module conversion. Overall the engine behaves better than it ever did with the Mopar module, though I doubt there's been much if any fuel mileage increase.

A Canadian friend calls them a "Majorly Shiatty Device."