I don't think I'll be buying a classic Ford again. I'm pretty sure this car hates me
I mocked up the booster. Fit ok (SUPER TIGHT THOUGH!) and while testing the brake pedal fit noticed there was no way in hell the arm provided with the kit was going to fit my factory disc brake pedal's pin. So off to the store for a 5/8" drill bit I may never use again. $17 later I had what I needed. Probably paid way too much but I needed it. With the hole drilled the correct size I was even able to use the factory bushing. Not something you would expect to have to do for a $320 kit that is supposed to be a direct fit for your car. Looking at parts online, the same hole diameter for the pedal pin was used from at least 65-69.
The bushing is swapped from the old part to the new one in the last pic, so you can see on the original how much larger the hole was... not even remotely close to large enough.