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Reply #19 –
Yeah, you're probably right. I never saw another Mustang with one at the time and until this day in fact, but they may have been popular elsewhere. Also, those year Mustangs are less popular at the shows I go to.
Since it was only produced from '70 - '74 as the era of smog engines was in full gear, it didn't have a long production run to exploit it's strengths (with the exception of some smart drag-racers.)