[22GT]

How much movement of the pedal before the release bearing contacts the pressure plate?

 

[22GT]

Aha. You should still be using the stock 66-70 bell, with the stock 66-70 pressure plate, and the stock 67-70 disc.

If you had the 64-65 clutch and bell, you could also stay stock, by using the 64-65 pressure plate, and a Mustang II disc.

Either way you have to use an adapter plate to attach the T5 to the bell.

Not sure why your adding an adjustable (66) lower rod helped, but OK. The geometry was the same 64-66. Keep an eye on the equalizer.

Note- The tiny standard for 64-66 170/200 was the 2.77 3-speed. I got my first Mustang, a 66 Sprint, for $200 because the trans needed rebuilding. I replaced all the bearings and seals etc. for about $20 at a friend's gas station. My first transmission job.

The 67-up 200 used the same 3.03 3-speed as the V8.