My Ford 999 report and Marti's report were a little different too. I contacted Marti and he doubled checked his report info and it was correct. I then called Ford and ordered another 999 report. That report matched Marti's. I would say Marti's report is correct. I have hear many 999 reports have errors in them.
The power dick brakes were included with the GT/GTA option package.
Kevin's data is always correct. He has to earn his living off of the accuracy of his reports while the Ford Service Help people get paid regardless of their accuracy. So why even mess with the 999 reports when their accuracy is always in question? BTW, Kevin is licensed by Ford for all Ford production data from 1967 to almost the present.
For the record, all 67 GTs came with power disc brakes. 1968 is the first year power disc brakes became optional on GTs.