If it's a Mallory ignition system component, that would not have been a Ford item at all. That I think was an aftermarket rev limiter to help avoid a problem with over-revving the engine and blowing a rod when these cars were shifting. I've not seen one of these in years but it's not anything special like Jim said. Current vehicles have this programmed into their computer control modules now so that there is a limit to the damage people can do with currently marketed vehicles if they hit the throttle with no engine loading.
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