I could be out of line, but to ask the question, did you check the total outer dimension of the bearings in relation to the clutch pedal shaft length? With the big washers plus the bearing, it look to be quite wide. Why I say that is because on my conversion using Mustang Steves' set-up, I needed to turn .030" off each the bearing holders plus grind them to compensate for the draw angle on the bracket. i.e. the bracket side were not parallel top to bottom if that makes sense. I did not add any washers to the outside. I don't know if it makes any difference, but I was working on a 71 factory 4 speed car.
On the diagram that came with my kit, the clutch pedal and brake pedal pivot on the same shaft. Not so on the 71-73's. The brake pivots from a bolt through the two small holes rear of the clutch pivot. ( I just checked on my car, couldn't quite remember!!) I also came up with a total assembled width of 3.500" including a couple of shims needed to allow free movement of the bearings. I realize this could be very different to the SD version, but at the end of the day, the shaft length is the same.
To be honest, I could have very easily made my own bearing set-up knowing what I know now and kinda wish I had.
Another question, what linkage system are you going to use for the clutch? Are you going with hydraulic or cable as I doubt you'll be going the factory Z bar route. Also you'll have no reverse shift lock either.
I hope I'm not being too critical, but I've found it all too easy to overlook something simple and have to redo things. Or is that just me that F's up!!
Please let us know how it works out.
Geoff.