Clutch pedal with 6" pin to pin distance?

I was looking at my clutch pedal today and I was considering doing the modification in this article.
http://www.hotrod.com/how-to/transm...12-four-speed-a-body-clutch-pedal-adjustment/
Then I sat down and took some measurements. Now I've heard of some A body pedals being 6" from pin to pin but mine measures 5.750". So would you call this a 6" one or is this something really odd.
This is out of an original '72 340 Demon.

Thanks.....................Ted