I did the same thing with the same kit.... Once you get the booster bolted on, it lines up really well. Make sure you leave some play in the pedal. I adjusted mine too far out the first time, and had horrible brake drag. I had to pull the booster out and screw the clevis in 4 turns, and bolt it all back up.. Drag gone.
1957 Thunderbird 289 1967 Firebird Base 461 1968 C-20 327