Gentlemen...The 5.0 6250rpm rev-limiter is a fuel cut-off, not electrical.
It is controlled by the EEC computer ONLY, NO MSD, CRANE, or other "BOX" will by-pass it, only piggyback EEC controller units can "override" EEC control inputs.
And...with your setup there is no reason to rev past 6250 and still make power, your package needs a change.
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