Below is a response I got after contacting Mustang Steve. Clears up the offset question. I could have more, for the variety of reasons he has listed. One thing that will change my spacing by a little would be to replace the rubber stop on the clutch pedal support. Mine is "pounded" down to only about 1/8in thick. I looked at pictures of new ones, and they appear to be more like 1/4 to 3/8 thick. I replaced all my bushings in things, and my pins were not really wore much like from metal on metal, other than the rod to hole connection on the clutch pedal to equalizer bar. I still have a little play in there even with new bushings, and there is visible wear. At some point I will need to address that by either renewing the hole in clutch pedal, and buying a replacement rod or getting all new. Clutch pedals are not cheap though.
He also sent me some photos of a stock 67 in a GT500 and a 69 stang clearly showing the offset in both.
"David,
The offset on 67-70 power brake cars was original. See attached pic of 67 GT500 and 69 Mustang pedals. Usually the clutch pedal is about 1” to 1-1/2” higher than the brake pedal. This can vary a bit, usually caused by worn bushings in the clutch pedal shaft. BBK kit will make it fit as original. (
https://www.mustangsteve.com/product/bbk/ )
There were two different clutch pedals in 67-69, but both sit at the same height. One of the pedals has an offset bracket to move the actuation rod to the side a bit.
Michael,
MustangSteve"
Thanks for everyone's help on this. Great site with very helpful members!
David