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User Rides / My 85 TBird
One question and one comment.
Have you had a chance yet to jack up the rear of the chassis to see how much droop travel the rear suspension has with the Mustang shocks at the ride height that you have the car at?
I think you are going to have one problem with the hydroboost installation. All of the 1987-88 T-Birds have a 3.5:1 pedal ratio. That is the pedal pad moves 3.5 units for each unit that it pushes the m/c pushrod. I do not have the data for your 1985 2.3l turbo, but I assume it is the same. You can check you pedal ratio be measuring the physical brake pedal dimensions and dividing one by the other.
The Mustang that you pulled the hydroboost unit from has a pedal ratio of 4.75:1.
Since you appear to have connected the hydroboost unit pushrod to the 3.5:1 pedal pin, the required pedal effort and travel is going to be quite a bit different than what Ford designed. The brake pedal effort is going to be 36% (4.75/3.5) higher. The travel at the pedal pad is going to be reduced by the same amount.
To correctly fix this, the pin on the brake pedal should be moved upwards slightly less than 1" (0.97") and the hydroboost unit should be raised on the firewall to correctly align the pushrod so it is straight.
On second thought, since your rear brake calipers have 60% more piston area than the Mustang rear calipers the hydroboost system was designed around, I would only raise the pin on the brake pedal 0.75".